VASSILIS CHRISTOPHIDES
PERSONAL
	Address:	Department of Computer Science	Phone:	+30 (2810) 393538
			University of Crete	Fax:	+30 (2810) 393501
			Knossos Ave., P.O.Box 2208	WWW:	www.csd.uoc.gr/~christop
			GR-71409, Heraklion, Crete (Greece)	Email:	christop@csd.uoc.gr
	 	Institute of Computer Science	Phone:	+30 (2810) 391628
			FORTH	Fax:	+30 (2810) 391638
			Vassilika Vouton, P.O.Box 1385	WWW:	www.ics.forth.gr/~christop
			GR-71110, Heraklion, Crete (Greece)	Email:	christop@ics.forth.gr

RESEARCH INTERESTS
Databases and Web Information Systems: XML/RDF Storage and Indexing Schemes, Semantics-aware Data Models and Query Languages, Heterogeneous Information Integration, Change Management, Graphical Query Interfaces.
Digital Libraries: Personalization and Preference Management, Peer-to-Peer Data and Knowledge Management Systems, Publish/Subscribe Systems, Graph Mining and Power Laws.
Scientific Systems: Workflow Management Systems, Description and Composition of e-services, Data Provenance and Annotation Management.

PROFESSIONAL SOCIETIES
Member of ACM-SIGMOD, Technical Chamber of Hellas.

EDUCATION
Ph.D.: 	Conservatoire National des Arts et Métiers (CNAM) Paris, France, October 1996.
	Thesis Title: Structured Documents and Object Databases. 
	Advisors: Michel Scholl and Sophie Cluet.
D.E.A.: 	Information Systems, University Pierre et Marie Curie (Paris VI), France, June 1992.
	Thesis Title: Hypertext Databases.
	Advisor: Michel Scholl
Diploma:	 Electrical Engineering, National Technical University of Athens (NTUA), Hellas, July 1988.
	Thesis Title: Medical Information Systems.
	Advisors: Manolis Skordalakis and Yannis Kollias.

EMPLOYMENT HISTORY
Department of Computer Science, University of Crete, Hellas
Professor(10/2009-), Associate Professor(10/2004-10/2009), Assistant Professor(01/2002–10/2004)
Institute of Computer Science Foundation for Research and Technology-Hellas 
Associate Researcher (10/1999-01/2002), Assistant Researcher (10/1997-10/1999)
       Computer Science Department, Conservatoire National des Arts et Métiers (CNAM) Paris 
             Visiting Assistant Professor (1995-1996), Teaching Assistant (1993-1995)

COURSES TAUGHT
Database Systems Implementation advanced undergraduate level (5 times, www.csd.uoc.gr/~hy460).
Advanced Topics on Database Management Systems (DBMS), graduate level (5 times).
Web Data Management, graduate level topics course (6 times, www.csd.uoc.gr/~hy561).
Object-Oriented Programming, undergraduate level (8 times, www.csd.uoc.gr/~hy252).
Introduction to Relational DBMS, undergraduate level (3 times).
Electronic Document Management Systems, graduate level topics course (twice).
Applications of Object/Relational DBMS, advanced undergraduate level (once).
Operating Systems and Application Development Tools, undergraduate level course exercises (once).

AWARDS AND DISTINCTIONS 
•	ISWC 2007 Best Paper Award
•	ACM/SIGMOD 2004 Test of Time Award
•	ISWC 2003 Best Paper Award
•	Postdoctoral Fellowship (1996-1997), Institute of Computer Science, Foundation for Research and Technology-Hellas (FORTH-ICS), Heraklion, Crete, Greece.
•	PhD Fellowship (1992-1995) of the French Ministry of Research and Education at the Verso Group, Institut National de Recherche en Informatique et Automatique (I.N.R.I.A), Paris, France.
•	Graduate Scholarship (1991-1992) of the Bodosakis Foundation at the University Pierre et Marie Curie (Paris VI), Paris, France.
ΜΑΙΝ RESEARCH GRANTS
•	Organization and promotion of the academic content of the University of Crete Operational Program Digital Convergence, ESPA (Scientific Coordinator, budget 771.400€)
•	HYDROBIONETS - Autonomous Control of Large-Scale Water Treatment Plants Based on Self-Organized Wireless BioMEM Sensor and Actuator Networks (CP 287613, total budget 3.718.914€, FORTH-ICS budget 637.518€, FORTH-ICS-ISL budget 99.560€) (with P. Tsakalidis and D. Kotzinos)
•	APARSEN - Alliance Permanent Access to the Records of Science in Europe Network, (NoE 269977, total budget 8.687.572€), FORTH-ICS budget 310.240€ (with G. Antoniou, Y. Tzitzikas)
•	Greek Archive of Monuments, Digitization of archival material at the Greek Archive of Monuments, FORTH-ICS budget 367.080€ (with M. Doerr)
•	KPLab - Developing Knowledge Practices Laboratory, Integrated Project, (IP 27490, total budget 14.241.444€) Member of Project Management Board and FORTH-ICS Scientific Coordinator with budget 939.132€ (with D. Kotzinos, G Flouris)
•	CASPAR - Cultural, Artistic and Scientific Knowledge for Preservation, Access and Retrieval Integrated Project, (IP 33572, total budget 15.078.563€) FORTH-ICS Scientific Coordinator with budget 665.400€ (with Y. Tzitzikas, G. Flouris) 
•	DELOS - Network of Excellence in Digital Libraries, (NoE 507618, total budget 15.700.000€), FORTH-ICS budget 434.400€ (with C. Stephanidis, M. Doerr) 
•	UBI-ERAT-LUPA, European Culture 2000 (Project No 2002 - 0462/001-001 CLT-CA22 , total budget 900.000€), FORTH-ICS budget 187.500€ (with M. Doerr)
•	CRISATEL - Conservation Restoration Innovation Systems for image capture and digital Archiving to enhance Training, Education and longlife Learning, European (IST-1999-20163, total budget 2.669.820€), FORTH-ICS budget 230.000€ (with M. Doerr) 
•	SeLeNe - Self e-Learning Networks, (IST 39045, total budget 283.000€) FORTH-ICS Scientific Coordinator budget 59.000€ (with D. Kotzinos)
•	QuestionHow - Quality Engineering Solutions via Tools, Information and Outreach for the New Highly-enriched Offerings from W3C: Evolving the Web in Europe (IST- 2000-28767) FORTH-ICS budget 20.000€ (with E. Markatos)
•	OntoWeb - Network of Excellence on Ontology-based Information Exchange for Knowledge Management and Electronic Commerce, (IST-2000-29243, total budget 1.866.332€), FORTH-ICS Scientific Coordinator with budget 51.600€ (with D. Plexousakis) 
•	MESMUSES - Metaphors for Science Museums, (IST-26074, total budget 2.386.166€) FORTH-ICS Scientific Coordinator with budget 304.988€ (with D. Plexousakis)
•	C-Web - A Generic Platform Supporting Community Webs, (IST 13479, total budget 342.401€) FORTH-ICS Scientific Coordinator with budget 79.200€
•	ECTourism - An Electronic Commerce System for the Provision of Tourism Services over Internet, General Secretariat of Research and Technology, Greek Ministry of Development, total budget 1.115.187€, FORTH-ICS budget 358.034€ (with D. Plexousakis) 
•	ARION - An Advanced Lightweight Architecture for Accessing Scientific Collections, (IST 25289, total budget 860.000€) FORTH-ICS budget 280.000€ (with C. Houstis)
•	Thetis - A Data Management and data Visualization System for Supporting Coastal Zone Management for the Mediterranean Sea (F0069, total budget 550.000€) FORTH-ICS budget 250.000€ (with C. Houstis)
•	Aquarelle - Sharing Cultural Heritage through Multimedia Telematics (IE-2005, total budget 6.009.756 Ecus) FORTH-ICS budget 344.622Ecus (with P. Constantopoulos, M. Doerr) 
•	CIMI Z39.50 - Testbed, FORTH-ICS budget 2000$
PROFESSIONAL ACTIVITIES
General Chair
    2009 International Workshop on the role of Semantic Web in Provenance Management (SWPM), co-located with the 8th International Semantic Web Conference ISWC-2009, October 25-29, 2008 Washington, DC (wiki.knoesis.org/index.php/SWPM-2009)
	2007 Joint ODBIS & SWDB workshop on Semantic Web, Ontologies, Databases (SWDB-ODBIS’07), University of Vienna, Austria, September 23-24, 2007 (lsdis.cs.uga.edu/swdb-odbis07).
Program Committee Chair
	8th Extended Semantic Web Conference (ESWC’11) Semantic Data Management Track with Axel Polleres Heraklion, Greece May 29 -June 4, 2011 (www.eswc2011.org)
	2nd International Workshop on Personalized Access, Profile Management, and Context Awareness in Databases (PersDB 2008). In conjunction with VLDB’08, Auckland, New Zealand, 24-30 August 2008 (persdb08.stanford.edu).
	1st International Workshop on Database Preservation (PresDB’07), March 23 2007, Edinburgh, Scotland (homepages.inf.ed.ac.uk/hmueller/presdb07).
	4th Hellenic Data Management Symposium (HDMS), August 25-26 2005, Athens, Greece (www.ics.forth.gr/hdms05).
	2nd IST Workshop on Metadata Management in Grid and P2P systems (MMGPS’04) - Models, Services and Architectures, with Alex Poulovassilis, 17th December 2004, University of London (www.ics.forth.gr/isl/ist_workshop/mmgps04/index_04.htm).
	2004 IEEE International Conference on Services Computing (SCC'04), Web Services Track, with Jianwen Su, Shanghai China September 15 - 18, 2004 (conferences.computer.org/scc/2004/).
	IX Conference on Extending Database Technology (EDBT’04), Industrial Track, Heraklion – Crete, Greece March 14 - 18 2004 (www.edbt04.gr).
	1st IST Workshop on Metadata Management in Grid and P2P systems (MMGPS’03) - Models, Services and Architectures, with Alex Poulovassilis, 16th December 2003, University of London (www.ics.forth.gr/isl/ist_workshop/mmgps03/index_03.htm).
	6th International Workshop on the Web and Databases (WebDB’03), with Juliana Freire, San Diego, California, USA, June 12-13, 2003 (www.webdb03.gr).
	1st International Workshop on the Semantic Web: Models, Architectures and Management (SemWeb’00), with D. Plexousakis, P. Constantopoulos, 21 September 2000, Lisbon, Portugal (www.ics.forth.gr/isl/SemWeb/).
Program Committee Vice-Chair
  7th Int’l Semantic Web Conference (ISWC), Karlsruhe DE, 26-30 October 2008 (iswc2008.semanticweb.org)
Program Committee Member
	Int’l ACM SIGMOD Conference, 2003.
	Int’l Conference on Very Large Databases (VLDB), 2009, 2005, 2003 & 2002.
	Int’l Conference on Extending Database Technology (EDBT) 2013, 2009, 2008, 2006 & 2004.
	Int’l World Wide Web Conference (WWW), 2008, 2006, 2005, 2004 & 2002.
	Int’l Conference on Knowledge Discovery & Data Mining (KDD), 2006.
	Int’l Conference on Automata Languages & Programming (ICALP) 2013
	European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases (ECML PKDD), 2011.
	Int’l Semantic Web Conference (ISWC), 2012, 2007, 2003, 2002.
	Int’l Conference on Web Information Systems (WISE), 2011, 2010 & 2004.
	Int’l Conference on Web Engineering (ICWE), 2004.
	IEEE International Conference on Web Services (ICWS), 2005, 2006.
	Int’l East-European Conference on Advances in Databases and Information Systems (ADBIS), 2006.
	Int’l Conference on Management of Data (COMAD), 2004.
	European Conference on Digital Libraries (ECDL), 2010, 2003 & 1999.
	Int’l Conf. on Ontologies, Databases and Applications of Semantics (ODBASE), 2007, 2006 & 2002. 
   Int’l Conf. on Model & Data Engineering (MEDI), 2011.
	Int’l Conf. on Signal Image Technology & Internet Based Systems (SITIS), 2011.
	Int’l Symposium on Applications and the Internet (SAINT), 2004.
	Int’l Workshop on Data and Services Management in Mobile Environments (DS2M), 2008.
	Int’l Conference on Semantics of a Networked World: Semantics for Grid Databases (ICSNW), 2004.
	10th DELOS Thematic Workshop on Personalized Access, Profile Management, and Context Awareness in Digital Libraries (PersDL) 2007.
	Int’l Workshop on Personalized Access, Profile Management, and Context Awareness in Databases (PersDB) 2009.
	Int’l Workshop on the Web and Databases (WebDB), 2010 & 2009, 2001.
	Int’l XML Database Symposium (XSym), 2004.
	Int’l Workshop on Web Information and Data Management (WIDM), 2007.
	Int’l Workshop on Semantic Search over the Web (SSW), 2011.
	Int’l Workshop on Data Engineering meets the Semantic Web (DESWeb), 2010.
	Int’l Conference on Current Trends in Theory and Practice of Computer Science (SOFSEM), 2010.
	Int’l Workshop on E-Services and the Semantic Web (ESSW), 2003.
	Int’l Workshop on Peer-to-Peer Computing & DataBases (P2P&DB), 2004.
	Int’l Workshop on Semantic Intelligent Middleware for the Web and the Grid (SIMWebGrid), 2004.
	ACM Symposium on Applied Computing (SAC), Web Technologies & Applications Track, 2004.
	Int’l Conference on Management of Emergent Digital EcoSystems (MEDES) 2012 & 2011:
	Int’l Workshop on Resource Discovery (RED), 2011.
	Int’l FLAIRS Conference, Semantic Web Track, 2002.
	EuroWeb Conference, 2002.
	Int’l Workshop on Building Technology Enhanced Learning solutions for Communities of Practice (TEL-CoPs), 2007 & 2006.
	Int’l Workshop on Application & Security Services in Web Pervasive Environments (ASWAN), 2007. 
	Int’l Workshop on Multi-agent systems and Peer-to-Peer Computing at the Autonomous Agents and Multi-Agent Systems (AAMAS), 2002.
	Int’l Workshop on Foundations of Models and Languages for Data and Objects: Databases, Logic and Semistructured Data (FMLDO), 2002.
	Mediterranean International Conference on Computer Technologies (MICCT), 1999.
	Hellenic Data Management Symposium (HDMS), 2002-2011 (every year).
	Journées Bases de Données Avancées (BDA), 2009, 2001 & 1998.
Editorial Review Board Member 
	International Journal on Semantic Web and Information Systems (IJSWIS), Jan 2007 - present.
	Data & Knowledge Engineering Journal – Elsevier Special Issue on Contribution of Ontologies in  
	Designing Advanced Information Systems, Guest Editors: L. Bellatreche, G. Pierra, Y. Aït Ameur.
Guest Editor 
	Special Issue on Scalability and Performance of Semantic Web Systems IJSWIS 5(2) 2009.
Journal Referee
	Communications of ACM (CACM), ACM Transactions on Database Systems (TODS), ACM Transactions on Information Systems (TOIS), ACM Transactions on Internet Technology (TOIT), VLDB Journal, IEEE Transactions on Knowledge and Data Engineering (TDKE), Journal on Distributed and Parallel Systems (DPS), Springer Int'l Journal Knowledge and Information Systems (KAIS), IEEE Intelligent Systems Journal, Int'l Journal on Digital Libraries (JDL), Int'l Journal of Cooperative Information Systems (IJCIS), Int'l Journal of Information Technology (IJIT), Int'l Journal of Semantic Web & Information Systems (IJSWIS), Elsevier Int'l Journal of Information Systems (IS), Elsevier Journal of Web Semantics (JWS), Elsevier Int'l Journal of Computer Networks and ISDN Systems, Theory and Practice of Object Systems (TAPOS), Int'l Journal on Universal Access in the Information Society (UAIS).
Conference/Workshop Referee
   IEEE Data Engineering Conference (ICDE), 2005.
	Int’l Joint Conference on Artificial Intelligence (IJCAI), 2003.
   ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems (PODS), 2003.
	ACM SIGMOD Conference, 1997 &1996. 
	Int’l Workshop on Database Programming Languages (DBPL), 2001.
	Hellenic Conference on Artificial Intelligence (SETN), 2006 & 2002.
Reviewer
	General Secretariat for Research and Technology, 2010 (Action Support of New Enterprises in 
   Research and Development Activities-ESPA) Member of the Reviewing Board
	Netherlands Organization for Scientific Research (NWO), 2010 (Physical Sciences)
	Agence National de la Recherche (ANR) France, 2012, 2009, 2008 (PROGRAMME BLANC)
	INRIA International Cooperation Projects France/US, 2005 (GEMSAD project)
	Habilitation Thesis François Goasdoué,  Université Paris-Sud, 2012 (external reviewer)
  	Ph.D. Thesis of Myriam Ben Saad-Paris 6-LIP6, 2011 (external reviewer)
	Ph.D. Thesis of Z. Kaloudi, Univ. of Athens, 2011 (examination committee member)
   Ph.D. Thesis of C. Stefanidis, Univ. of Ioannina, 2009 (examination committee member)
	Ph.D. Thesis of V. Tsiaras, Univ. of Crete, Heraklion, 2009 (examination committee member)
   Ph.D. Thesis of G. Koloniari, Univ. of Ioannina, 2003-2008 (member of the supervision committee)
	Ph.D. Thesis of K. Kritikos, Univ. of Crete, Heraklion, 2008 (examination committee member)
	Ph.D. Thesis of S. Souldatos, NTUA, Athens, 2008 (examination committee member)
	Ph.D. Thesis of F. Alkhateeb, Univ. Joseph Fourier - Grenoble 1, 2008 (external reviewer)
	Ph.D. Thesis of I. Sebei, CNAM, Paris, 2007 (examination committee member)
	Ph.D. Thesis of G. Flouris, Univ. of Crete, Heraklion, 2006 (examination committee member)
	Ph.D. Thesis of G. Koutrika, Univ. of Athens, 2005 (examination committee member)
	Ph.D. Thesis of Tuan Anh Tα, ENST, Paris, 2005 (external reviewer)
	Ph.D. Thesis of T. Dalamangas, NTUA, Athens, 2004 (examination committee member) 	Ph.D. Thesis of B. Nguyen, Univ. Paris XI (Orsay), 2003 (external reviewer)
	Ph.D. Thesis of Y. Tzitzikas, Univ. of Crete, Heraklion, 2002 (examination committee member)
Scientific Evaluation Committees
2011 Computer Science Division, School of Electrical and Computer Engineering, NTUA, «Data Management in Distributed Environments»
2010 Department of Informatics, University of Piraeus «Net-centric Computing Systems»
2010 Department of Informatics, Ionian University «Net-centric Information Systems»
2010 Department of Digital Systems, University of Piraeus «Methodologies and Architectures of Service-oriented Information Systems»
2010 Department of Informatics, University of Athens «Software Systems for the WWW (Search Engines, Crawling, Hidden/Deep Web, Social Networks, Tagging, Annotation and Ranking Systems)»
2004 Department of Computer Science, University of Crete «Information Systems»
Advisor/Consultant
	Consultant to AM2 Systems, Paris, France (2003-2004)
Univ. of Crete Department of Computer Science, Committee Member
	National Academic Recognition Information Center (NARIC) – vice member of the board of directors section new technologies (2010-)
	ERASMUS students advisory committee and academic recognition of courses – member (2008-)
	France-Greece Graduate Studies Program CSD/ Paris XI/Josef Fourier Grenoble– coordinator (2008-2010)
	Senate of Univ. of Crete- member (2003-2004)
Undergraduate Studies Program - member (2002-2006)

SABBATICALS AND STUDY LEAVES
•	(March 2011) Visiting Professor, Laboratoire d'Informatique de Paris 6, France
•	(February 2011) Visiting Professor, Informatics Department, Université de Cergy-Pontoise, France
•	(June 2010) Visiting Professor, CNAM Paris, France
•	(June 2009) Visiting Professor, CNAM Paris, France
•	(January 2009) Visiting Professor, Laboratoire d'Informatique de Paris 6, France
•	(June-July 2008) Visiting Professor, Laboratory for Computer Science, Université Paris-Sud, France
•	(May-June 2008) Visiting Professor, Département Maths-Info, Université Paris-Dauphine, France
•	(March-April 2008) Visiting Professor, CNAM Paris, France
•	(January- February 2008) Visiting Scientist, INRIA Saclay, France
•	(December 2007) Visiting Professor, Department of Computer Science, University of Cyprus
•	(September-November 2007) Visiting Professor, Laboratory for Foundations of Computer Science, University of Edinburgh, UK
•	(February 2006) Visiting Professor, Laboratory for Computer Science, Université Paris-Sud, France
•	(June 2002) Visiting Professor, CNAM Paris, France
•	(June-July 2001) Visiting Scientist, Network Data and Services Group, Lucent Bell-Labs, US
•	(July 2000) Visiting Scientist, Network Data and Services Group, Lucent Bell-Labs, US
•	(March-June 2000) Visiting Professor, Computer Science and Engineering Department, University of California, San Diego, US
M.Sc. STUDENTS 
	Univ. of Crete
	   Nelly Vouzoukidoy November 2011   Evaluating Continuous Top-k Queries over Text Streams
	   Petros Tsialamanis  September 2011   Heurist-based SPARQL optimization over Column-Store DBMS
	Harry Kourdounakis	January 2011	Subscription Indexes for Web Syndication Systems
	Yannis Roussakis	December 2010	A Preference-Based Repairing Framework for Curated 
			Knowledge bases
	Vicky Papavasileiou	December 2009	High-level Ontology Change Detection
	Panagiotis Pediaditis	December 2008	Querying and Updating RDF/S Named Graphs
	Georgia Kitsiou	March 2008	Data Quality Metrics in RDF-based PDMS
	Dimitris Zeginis	March 2008	On Computing Deltas between RDF Knowledge Bases
	Vassilis Tsisparas	March 2008	Trial & Error: Data Transformation and Provenance
			techniques in Scientific Workflows
	Dimitris Andreou	December 2007	Semantic Web Middlewares and Versioning Services
	Yannis Theoharis	February 2007	On Power Laws and the Semantic Web
	Yannis Kapantaidakis January 2007	Rewriting Algorithms for Qualitative Preferences Queries
	Stavros Saxtouris	April 2006	RUL: a Declarative Language for Updating RDF Data
	Despoina Antonakaki April 2006	The MineBioText system: Discovery of Gene, Protein and 
			Disease Correlations
	Lefteris Sidirourgos	November 2005	Query Routing and Planning in a Peer Data Management 
			System
Giorgos Kokkinidis	July 2005	Semantic Query Routing and Planning in Peer-to-Peer 
		Database Systems: The SQPeer Middleware
	Miltos Stratakis	June 2005	A Functional Model for Qualitative Preferences
	Giorgos Serfiotis	March 2005	Integrating Relational Databases on the Semantic Web 
	Ioanna Koffina	February 2005	Integrating XML data sources using RDF/S Schemas: The
			ICS-FORTH Semantic Web Integration Middleware (SWIM)
	Stamatis Karvounarakis March 2004	Flexible E-Services Composition Middleware
	Xaris Gikas	February 2004	Authentication/Authorization Mechanisms for Scientific 
			E-Services
	Nikos Athanasis	February 2004	Semantic Web Portlets
	Giorgos Zaxaroudiakis November 2003	Smart Service Discovery Protocols for Personal Area 
			Networks Bluetooth
	Manolis Stamatogianakis November 2003 Architectures of Personal Area Networks using Bluetooth 
			technology
	Sotiris Tourtounis	January 2003	Encoding Schemes for Semantic Web Schemas
	Aimilia Maganaraki	November 2002	View Definition on RQL Databases
	Irini Giannoulia	April 2001	Designing Cultural Web Sites: The case of the Historical 
			Museum of Crete
	Vasso Partsanaki	February 2001	An XML Schema Generator from the Conceptual Reference 
			Model of ICOM/CIDOC
	Grigoris Karvounarakis October 2000	Querying RDF metadata for Community Web Portals
	Sofia Alexaki	October 2000	Storing RDF metadata for Community Web Portals
	Katerina Tolliou	October 1998	Design and Development of an SIS/WWW Gateway
	Tasos Kementsietsidis June 1998	Development of an SGML parser using LEX/YACC
	Yannis Velegrakis 	June 1998	Querying Heterogeneous and Distributed Data Sources using 
			Z39.50	
	INRIA, France
	Jerome Simeon	September 1995	Coupling a Full Text Index System with O2
	Leonid Lebas	September 1995	Development of a multi-format Report Generator for O2

INVITED TALKS/PRESENTATIONS
  "Data Management Perspectives": Panel at HDMS’11 Athens 19/06/2011. Moderator: Timos Sellis. Invited Panelists: Vassilis Vassalos, Alkis Polyzotis, Stratos Idraios, Vassilis Christophides.
  "Reflections on the Claremont Report on Database Research": Panel at HDMS’08 Heraklion, Crete 07/2008. Moderator: Yannis Ioannidis. Invited Panelists: Minos N. Garofalakis,  Peter Triantafillou, Timos Sellis, Vassilis Christophides.
	"From Semistructured/XML Data to the Semantic Web", HDMS'04 (keynote talk).
	"E-services: a look behind the curtain", with R. Hull, M. Benedikt, J. Su, PODS'03 (invited talk).
	"The Semantic Web: Myths and Reality", with D. Plexousakis, M. Scholl, V. Tannen, Onassis Lectures 2003 (Distinguished Lecturer Series).
	"System Infrastructure for Digital Libraries: A Survey and Outlook", with C. Nikolaou, EDBT'99 Summer School (Tutorial Lectures).
PUBLICATIONS
A. Refereed Journals
1.	G. Flouris, G. Konstantinidis, G. Antoniou and V. Christophides, "Formal Foundations for RDF/S KB Evolution". Knowledge and Information Systems (KAIS), Springer. 2012.
2.	Y. Theoharis, G. Georgakopoulos, V. Christophides, "PoweRGen: A Power-Law Based Generator of RDFS Schemas". Information Systems – Elsevier, 37(4): 306-319, 2012.
3.	Y. Theoharis, I Fundulaki, G. Karvounarakis, and V. Christophides, "On Provenance of Queries on Semantic Web Data," to appear in IEEE Internet Computing, 2011.
4.	D. Zeginis, Y. Tzitzikas, V. Christophides, "On Computing Deltas of RDF/S Knowledge Bases" to appear in ACM Transactions on the Web (TWEB), 2011.
5.	Y. Theoharis, Y. Tzitzikas, D. Kotzinos, V. Christophides, "On Graph Features of Semantic Web Schemas". IEEE Transactions On Knowledge And Data Engineering (TKDE), 20(5), May 2008.
6.	L. Sidirourgos, G. Kokkinidis, T. Dalamagas, V. Christophides, T. Sellis, "Indexing Views to Route Queries in a PDMS". Journal of Distributed and Parallel Databases (DPD), 23(1), February, 2008.
7.	Y. Tzitzikas, V. Christophides, G. Flouris, D. Kotzinos, H. Markkanen, D. Plexousakis, N. Spyratos, "Emergent Knowledge Artifacts for Supporting Trialogical E-Learning", International Journal of Web-based Learning and Teaching Technologies (IJWLTT), 2(3), pp 19-41, July-September 2007.
8.	I. Koffina, G. Serfiotis, V. Christophides, V. Tannen, "Mediating RDF/S Queries to Relational and XML Sources", International Journal on Semantic Web & Information Systems (IJSWIS), 2(4), pp 68-91, October - December 2006.
9.	A. Magkanaraki, V. Tannen, V. Christophides, D. Plexousakis, "Viewing the Semantic Web Through RVL Lenses". Journal on Web Semantics: Science, Services and Agents on the World Wide Web (JWS), Vol. 1(4), pp 359-375, 2004.
10.	V. Christophides, G. Karvounarakis, D. Plexousakis, Michel Scholl, S. Tourtounis, "Optimizing Taxonomic Semantic Web Queries Using Labeling Schemes". Journal of Web Semantics: Science, Services and Agents on the World Wide Web (JWS), 1(2), 2004.
11.	G. Karvounarakis, A. Magkanaraki, S. Alexaki, V. Christophides, D. Plexousakis, M. Scholl, K. Tolle. "Querying the Semantic Web with RQL". Journal of Computer Networks and ISDN Systems, Vol. 42(5), pp 617-640, August 2003.
12.	J. Robie, L. M. Garshol, S. Newcomb, M. Biezinski, M. Fuchs, L. Miller, D. Brickley, V. Christophides, G. Karvounarakis. "The syntactic Web: Syntax and semantics on the Web". Journal of Markup Languages: Theory and Practice, 3(4), pp 411-440, 2001.
13.	Y. Velegrakis V. Christophides, P. Constantopoulos. "On Z39.50 Wrapping and Description Logics". International Journal of Digital Libraries (JDL) 3(3), pp 208-220 October 2000.
14.	A. Michard, V. Christophides, M. Scholl, M. Stapleton, D. Sutcliffe, A-M. Vercoustre.  "The Aquarelle Resource Discovery System". Journal of Computer Networks and ISDN Systems 30(13), pp 1185-1200, August 1998.
15.	S. Abiteboul, S. Cluet, V. Christophides, T. Milo, G. Moerkotte, J.Simeon. "Querying Documents in Object Databases". International Journal of Digital Libraries (JDL), 1(1), pp 5-19, April 1997.
Other Journals/Bulletins
1.	V. Christophides, J. Heflin Editorial Special Issue on Scalability and Performance of Semantic Web Systems IJSWIS 5(2) 2009
2.	V. Christophides, P. Buneman, Report of the “First International Workshop on Database Preservation (PresDB’07)”, SIGMOD Record 36(3), pp 55-58, September 2007.
3.	K. Keenoy, A. Poulovassilis, V. Christophides, G. Loizou, G. Kokkinidis, G. Samaras, N. Spyratos, Report of the “First International Workshop on Metadata Management in Grid and Peer-to-Peer Systems”, SIGMOD Record  33(3),  pp 96 – 100,  September 2004.
4.	V. Christophides, G. Karvounarakis, A. Magkanaraki, D. Plexousakis, V. Tannen, "The ICS-FORTH Semantic Web Integration Middleware (SWIM)". In Bulletin of the IEEE Technical Committee on Data Engineering, December 2003.
5.	P. Constantopoulos, V. Christophides, D. Plexousakis, Report of the " First International Workshop on Semantic Web Workshop: Models, Architectures and Management", SIGMOD Record 30(3), pp 96-100, September 2001.
6.	V. Christophides, R. Hull, A. Kumar, J. Simeon. "Workflow Mediation using VorteXML". In Bulletin of the IEEE Technical Committee on Data Engineering, 24(1), pp 40-45, March 2001.
7.	C. Houstis, C. Nikolaou, S. Lalis, S. Kapidakis, V. Christophides, A. Tomasic, E. Simon. "Towards a Next Generation of Open Scientific Data Repositories and Services". In Special issue on Digital Libraries, CWI Quarterly (Centrum voor Wiskunde en Informatica), Amsterdam Netherlands, pp 111-132, Vol. 12(2), June 1999.
8.	V. Christophides, S. Cluet, G. Moerkotte, J. Simeon. "Optimizing Generalized Path Expressions Using Full Text Indexes". In Networking and Information Systems Journal, Jean Ferrie and Jean-Pierre Giraudin Editors, Vol. 1(1-2), pp 177-194, 1998, Hermes.
C. Book Chapters and Encyclopedias
1.	C. Richter, H. Allert, V. Tchoumatchenko, I. Furnadziev, T. Vasileva, D. Kotzinos, G. Flouris, V. Christophides. "A Pragmatic Approach to Collaborative Semantic Modeling: The Visual Modeling (Language) Editor" at "Knowledge Practices and Transformative Technologies: Theoretically, empirically, methodologically and technologically oriented contributions" (Forthcoming).
2.	M. Doerr, A. Kritsotaki, D. Kotzinos, V. Christophides. "Reference Ontology for Knowledge Creation Processes" at "Knowledge Practices and Transformative Technologies: Theoretically, empirically, methodologically and technologically oriented contributions", (Forthcoming).
3.	C. Richter, E. Simonenko, T. Sugibuchi, N. Spyratos, F  Babic, J. Wagner, J. Paralic, M. Racek, C. Damşa, V. Christophides. "Mirroring Tools for Practice Transformation" at "Knowledge Practices and Transformative Technologies: Theoretically, empirically, methodologically and technologically oriented contributions" (Forthcoming).
4.	Y. Tzitzikas, Y. Marketakis, V. Christophides, Preservation of Intelligibility of Digital Objects, Springer, in D.G. Giarretta ed. Advanced Digital Preservation, 2011.
5.	V. Christophides "Resource Description Framework Schema (RDFS)". Encyclopedia of Database Systems. Liu, Ling and Özsu, M. Tamer (eds). Springer-Verlag, 2009.
6.	V. Christophides "Towards RDF/S-based Data Management Systems". Special Edition of the Hellenic Artificial Intelligence Society, 2008 (online edition).
7.	D. Kotzinos, G. Flouris, Y. Tzitzikas, D. Andreou, V. Christophides “Supporting Evolution of Knowledge Artifacts in Web Based Learning Environments” at “Solutions and Innovations in Web-Based Technologies for Augmented Learning: Improved Platforms, Tools and Applications” in “Advances in Web-Based Learning” series, IGI Global 2008.
8.	K. Keenoy, V. Christophides, G. Papamarkos, A. Poulovassilis, D. Kotzinos, P. Rigaux, N. Spyratos, P. T. Wood "Personalisation Services for Self e-Learning Networks" at  "Learning Grid Handbook" edited by the Learning GRID SIG, IΟS press, 2007.
9.	G. Kokkinidis, L. Sidirourgos, V. Christophides, "Query Processing in RDF/S-based P2P Database Systems" at Semantic Web and Peer-to-Peer, S. Staab, H. Stuckenschmidt (eds.), Springer-Verlag, 2006.
10.	G. Antoniou, V. Christophides, D. Plexousakis, "Semantic Web Fundamentals". Encyclopedia of Information Science and Technology (V) pages 2464-2468, 2005.
11.	G. Karvounarakis, A. Magkanaraki, S. Alexaki, V. Christophides, D. Plexousakis, M. Scholl, K. Tolle, "RQL: A Functional Query Language for RDF" at The Functional Approach to Data Management: Modelling, Analyzing and Integrating Heterogeneous Data, P.M.D. Gray, L. Kerschberg, P.J.H. King, A. Poulovassilis (eds.), LNCS Series, Springer-Verlag, 2003.
12.	V. Christophides. "Recherche Documentaire par Structure: une approache comparative entre SRI et SGBD". In "Le Traitement Electronique de Document", Jean-Claude Le Moal and Bernard Editors, pages 203-254, Aix en Provence, France, ADBS, October 1994.
D. Conference/Workshop Proc. Editor
1.	V. Christophides, C. Gutierrez, M. Collard: Proceeding of the Joint ODBIS & SWDB workshop on Semantic Web, Ontologies, Databases (SWDB-ODBIS’07): Revised Selected Papers, University of Vienna, Austria, September 23-24, 2007, LNCS 5005 Springer-Verlag 2008.
2.	E. Bertino, S. Christodoulakis, D. Plexousakis, V. Christophides, M. Koubarakis, K.  Bohm, E. Ferrari, Proc. of the 9th International Conference on Extending Database Technology (EDBT’04), Heraklion, Greece, March 14 - 18 2004, LNCS 2992, Springer-Verlag.
3.	V. Christophides, J. Freire, Proceeding of the Sixth International Workshop on the Web and Databases (WebDB'03). In conjunction with SIGMOD'03, June 12-13, 2003, San Diego, California.
E. Refereed Conferences
1.	Z. Hmedeh, H. Kourdounakis, V. Christophides, C. Du Mouza, M. Scholl, N. Travers. "Subscription Indexes for Web Syndication Systems". In Proc. of the 15th International Conference on Extending Database Technology (EDBT), March 26-30, 2012 Berlin, Germany.
2.	P. Tsialiamanis, L. Sidirourgos, I. Fundulaki, V. Christophides, P. Boncz. "Heuristic based Query Optimisation for SPARQL". In Proc. of the 15th International Conference on Extending Database Technology (EDBT), March 26-30, 2012 Berlin, Germany.
3.	Z. Hmedeh, N. Vouzoukidou, N. Travers, V. Christophides, C. du Mouza, Michel Scholl, "Characterizing Web Syndication Behavior and Content". In Proc. of the 12th Inter. Conf. on Web Information System Engineering (WISE), October 13 – 14, 2011, Sydney, Australia.
4.	J. Creus, B. Amann, V. Christophides, N. Travers, and Dan Vodislav, Optimizing large collections of continuous content-based RSS aggregation queries. 27èmes Journées Bases de Données Avancées (BDA), 24-27 Octobre 2011, Rabat, Maroc.
5.	V. Papavassiliou, G. Flouris, I. Fundulaki, D. Kotzinos and V. Christophides, "On Detecting High-Level Changes in RDF/S KBs" (Best Student Paper Award). In Proc of the 8th International Semantic Web Conference (ISWC), 25-29 October 2009, Washington, DC. 
6.	G. Flouris, I. Fundulaki, P. Pediaditis, Y. Theoharis, and V. Christophides, "Coloring RDF Triples to Capture Provenance". In Proc of the 8th International Semantic Web Conference (ISWC), 25-29 October 2009, Washington, DC.
7.	G. Konstantinidis, G. Flouris, G. Antoniou, V. Christophides, "A Formal Approach for RDF/S Ontology Evolution". In Proc. of the 18th Conference on Artificial Intelligence (ECAI’08), July 21-25 2008, Patra, Greece.
8.	P. Georgiadis, I. Kapantaidakis, V. Christophides, E. M. Nguer, N. Spyratos, "Efficient Rewriting Algorithms for Preference Queries". In Proc. of the 6th International Conference on Data Engineering (ICDE’08), April 7-12 2008, Cancún, México.
9.	D. Zeginis, Y. Tzitzikas, V. Christophides, "On the Foundations of Computing Deltas between RDF Models". In Proc. of the 6th International Semantic Web Conference (ISWC’07) and the 2nd Asian Semantic Web Conference (ASWC), November 11-15 2007, Busan, Korea (Best Paper Award).
10.	P. Georgiadis, V. Christophides, N. Spyratos, "Designing Personalized Curricula Based on Student Preferences”. In Proc. of the 25th ACM International Conference on Design of Communication (SIGDOC’07), October 22-24 2007, El Paso, TX, USA.
11.	Y. Theoharis, V. Christophides, G. Karvounarakis, "Benchmarking Database Representations of RDF/S Stores", In Proc. of the Fourth International Semantic Web Conference (ISWC'05), November 2005, Galway, Ireland, pp 685-701.
12.	M. Magiridou, S. Sahtouris, V. Christophides, M. Koubarakis, "RUL: A Declarative Update Language for RDF", In Proc. of the Fourth International Semantic Web Conference (ISWC'05), November, 2005, Galway, Ireland, pp 506-521.
13.	G. Serfiotis, I. Koffina, V. Christophides, V. Tannen, "Containment and Minimization of RDF/S Query Patterns", In Proc. of the Fourth International Semantic Web Conference (ISWC'05), November, 2005, Galway, Ireland, pp 607-623 (Nominated for Best Paper Award).
14.	D. Kotzinos, S. Pediaditaki, A. Apostolidis, N. Athanasis, V. Christophides, "Online Curriculum on the Semantic Web: The CSD-UoC Portal for Peer-to-peer e-learning", In Proc. of the 14th International World Wide Web Conference (WWW'05), May 10-14, 2005, Chiba, Japan.
15.	N. Athanasis, V. Christophides, D. Kotzinos, "Generating On the Fly Queries for the Semantic Web: The ICS-FORTH Graphical RQL Interface (GRQL)", In Proc. of the Third International Semantic Web Conference (ISWC'04), November, 2004, Hiroshima, Japan.
16.	K. Keenoy, A. Poulovassilis, V. Christophides, P. Rigaux, G. Papamarkos, A. Magkanaraki, M. Stratakis, N. Spyratos,P. Wood, "Personalisation Services for Self e-Learning Networks", In Proc. of the Fourth International Conference on Web Engineering (ICWE'04), July 2004, Munich, Germany. 
17.	A. Magkanaraki, V. Tannen, V. Christophides, D. Plexousakis, "Viewing the Semantic Web Through RVL Lenses", In Proc. of the Second International Semantic Web Conference (ISWC'03), October 20-23 2003, Sanibel Island, Florida, USA (Best Paper Award). 
18.	R. Hull, M.Benedikt, V. Christophides, J.Su "E-Services: a look behind the curtain". In Proc. of the Twenty-Second ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems (PODS’03), June 9-12 2003, San Diego, CA, USA (Invited Paper).
19.	V. Christophides, D. Plexousakis, M. Scholl, S. Tourtounis. ”On Labeling Schemes for the Semantic Web”, In Proc. of 12th International World Wide Web Conference (WWW'03), May 20-24 2003, Budapest, Hungary.
20.	C. Houstis, S. Lalis, V. Christophides, D. Plexousakis, E. Vavalis, M. Pitikakis, K. Kritikos, A. Smardas, "A Data, Computation and Knowledge Grid: the case of the ARION system", In Proc. of the 5th International Conference on Enterprise Information (ICEIS’03), April 23-26 2003, Angers, France.
21.	A. Magkanaraki, S. Alexaki, V. Christophides, and Dimitris Plexousakis. "Benchmarking RDF Schemas for the Semantic Web''.  First International Semantic Web Conference (ISWC'02), June 9-12 2002, Sardinia, Italy (Nominated for Best Paper Award).
22.	N. Spyratos, Y. Tzitzikas, V. Christophides. "On Personalizing the Catalogs of Web Portals", Special Track on Semantic Web at the 15th International FLAIRS'02 Conference, May 14-16 2002, Florida, USA.
23.	G. Karvounarakis, S. Alexaki, V. Christophides, D. Plexousakis, M. Scholl. "RQL: A Declarative Query Language for RDF". In Proc. of the 11th International World Wide Web Conference (WWW’02), 7-11 May 2002, Honolulu, Hawaii, USA.
24.	V. Christophides, R. Hull, A. Kumar. "Querying and Splicing of XML Workflows". In Proc. of the Sixth International Conference on Cooperative Information Systems (CoopIS’01), September 5-7 2001, Trento, Italy.
25.	G. Karvounarakis, V. Christophides, D. Plexousakis, S. Alexaki. "Querying RDF Descriptions for Community Web Portals".  In Proc. of BDA’01 (17iemes Journees Bases de Donnees Avances  - French Conference on Databases), Agadir, Maroc, 2001
26.	V. Christophides, S. Cluet, J. Simeon. "On Wrapping Query Languages and Efficient XML Integration". In Proc. of the ACM SIGMOD Conf. on Management of Data (SIGMOD’00), May 2000, Dallas, Texas, pp 141-152 ACM Press.
27.	Y. Velegrakis, V. Christophides, P. Constantopoulos. "Declarative Specification of Z39.50 Wrappers Using Description Logics". In Proc. of the 3rd European Conference on Digital Libraries (ECDL’99), September 1999, Paris, France, pp 381-402, Springer-Verlag.
28.	V. Christophides, M. Doer, I. Fundulaki. "A Semantic Network Approach to Semi-Structured Document Repositories". In Proc. of the 1st European Conference on Digital Libraries (ECDL'97), September 1997, Pisa, Italy, pp 305-324.
29.	V. Christophides, M. Dörr and I. Fundulaki. "The specialist seeks expert views: Managing digital folders in the AQUARELLE project". In Post Proc. of the International Conference on Museums and the Web 1997: Selected Papers.
30.	V. Christophides, S. Cluet, G. Moerkotte. "Evaluating Queries with Generalized Path Expressions". In Proc. of the ACM SIGMOD Conference on Management of Data (SIGMOD’96), pp 413-422, Montreal, Quebec, Canada, ACM Press, June 1996.
31.	V. Christophides, S. Abitebul, S. Cluet, M. Scholl. "From Structured Documents to Novel Query Facilities". In Proc. of the ACM SIGMOD Conference on Management of Data (SIGMOD’94), May 1994, Minnesota, pp 313-324, ACM Press.
32.	V. Christophides, A. Rizk. "Querying Structured Documents with Hypertext Links using an OODBMS". In Proc. of the ACM European Conference on Hypermedia Technology (ECHT’94), September 1994, Edinburgh, Scotland, pp 186-197, ACM Press.
33.	B. Amann, V. Christophides, M. Scholl. "HyperPATH/O2: Integrating Hypermedia Systems with Object-Oriented Database Systems" In Proc. of the 4th International Conference on Databases and Expert Systems Applications (DEXA'93), September 1993, Prague, Tcheque Republic, pp 709-720.
      F. Refereed Workshops
1.	Y. Stavrakas, G Papastefanatos, T. Dalamagas, V. Christophides: Diachronic Linked Data: Towards Long-Term Preservation of Structured Interrelated Information. In Proc. of the 1st Int. Workshop on Open Data (WOD), May 25, 2012, Nantes, France
2.	P. Pediaditis, G. Flouris, I. Fundulaki, V. Christophides: On Explicit Provenance Management in RDF/S Graphs. Workshop on the Theory and Practice of Provenance 2009.
3.	G. Konstantinidis, G. Flouris, G. Antoniou, V. Christophides, "On RDF/S Ontology Evolution". In Post Proc. of the Joint ODBIS & SWDB workshop on Semantic Web, Ontologies, Databases (SWDB-ODBIS’07), 24 September 2007, collocated with VLDB’07, Vienna, Austria.
4.	Y. Theoharis, G. Georgakopoulos, V. Christophides, "On the Synthetic Generation of Semantic Web Schemas". In Post Proc. of the Joint ODBIS & SWDB workshop on Semantic Web, Ontologies, Databases (SWDB-ODBIS’07), 24 September 2007, collocated with VLDB’07, Vienna, Austria.
5.	P. Georgiadis, V. Christophides, N. Spyratos, "Preference-Based Queries for Course Sequencing". In Proc. Of the 10th DELOS Thematic Workshop on "Personalized Access, Profile Management, and Context Awareness in Digital Libraries" (PersDL’07), in conjunction with the 11th Int'l Conference on User Modeling (UM’07), June 29-30 2007, Corfu, Greece.
6.	N. Spyratos, V. Christophides, P. Georgiadis, M. Nguer, "Semantics and Pragmatics of Preference Queries in Digital Libraries", In Proc. of the Workshop on “Knowledge Media Science”, October 2006, Meiningen, Germany.
7.	Y. Tzitzikas, V. Christophides, G. Flouris, D. Kotzinos, H. Markkanen, D. Plexousakis, N. Spyratos, "Emergent Knowledge Artifacts for Supporting Trialogical E-Learning", In Proc. of the 1st International Workshop on Building Technology Enhanced Learning solutions for Communities of Practice (TEL-CoPs'06), in conjunction with EC-TEL'06, October 1-4 2006, Heraklion Crete, Greece.
8.	N. Spyratos, V. Christophides, "Querying with Preferences in a Digital Library", In Post Proc. of the Dagstuhl Seminar (Nº 05182) Federation over the Web, May 2005.
9.	G. Kokkinidis, V. Christophides, "Semantic Query Routing and Processing in P2P Database Systems: The ICS-FORTH SQPeer Middleware", In Proc. of the First International Workshop on Peer-to-Peer Computing and Databases (P2P&DB'04), Co-located with EDBT’04, March 14 2004, Heraklion, Crete, Greece.
10.	V. Christophides, G. Karvounarakis, I. Koffina, G. Kokkinidis, A. Magkanaraki, D. Plexousakis, G. Serfiotis, V. Tannen, "The ICS-FORTH SWIM: A Powerful Semantic Web Integration Middleware", In Proc. of the First International Workshop on Semantic Web and Databases (SWDB), Co-located with  VLDB’03, September 7-8 2003, Berlin, Germany.
11.	C. Houstis, S. Lalis, V. Christophides, D. Plexousakis, M. Vavalis, M.  Pitikakis, K. Kritikos, A. Smardas, C. Gikas. "A Service Infrastructure for E-Science: the case of the ARION System''. In Proc. of the Workshop on Web Services, e-Business, and the Semantic Web: Foundations, Models, Architecture, Engineering and Applications. In conjunction with CAiSE'02, May 27-28 2002, Toronto, Ontario, Canada.
12.	V. Christophides, R. Hull, G. Karvounarakis, A. Kumar, G. Tong, M. Xong. "Beyond Discrete E-Services: Composing Session-Oriented Services in Telecommunications". In Proc. of the Second International Workshop on Technologies for e-Services (TES’01), in conjunction with VLDB’01, September 11-14 2001, Roma, Italy.
13.	S. Alexaki, V. Christophides, G. Karvounarakis, D. Plexousakis, K. Tolle. "On Storing Voluminous RDF Descriptions: The case of Web Portal Catalogs". Proc. of the 4th International Workshop on the the Web and Databases (WebDB2001). In conjunction with ACM SIGMOD/PODS, May 24-25 2001, Santa Barbara, CA.
14.	S. Alexaki, V. Christophides, G. Karvounarakis, D. Plexousakis, K. Tolle. "The ICS-FORTH RDFSuite: Managing Voluminous RDF Description Bases". In Proc. of the 2nd International Workshop on the Semantic Web. In conjunction with WWW10, May 1 2001, Hongkong, pp. 1-13.
15.	V. Christophides, D. Plexousakis, G. Karvounarakis, S. Alexaki. "Declarative Languages for Querying Portal Catalogs". In Proc. of the DELOS Workshop: Information Seeking, Searching and Querying in Digital Libraries (2000), December 11-12, 2000, Zurich, Switzerland, pp. 115-120.
16.	S. Alexaki, V. Christophides, G. Karvounarakis, D. Plexousakis, K. Tolle, B. Amann, I. Fundulaki, M. Scholl, A-M. Vercoustre. "Managing RDF Metadata for Community Webs". In Proc. of the 2nd International Workshop on The World Wide Web and Conceptual Modeling (WCM'00) in conjunction with The 19th International Conference on Conceptual Modeling (ER'00), October 9-12, 2000, Salt Lake City, Utah, pp. 140-151.
17.	V. Christophides, C. Houstis, S. Lalis, H. Tsalapata. "Ontology-driven Integration of Scientific Repositories". In Proc. of the Fourth Workshop on Next Generation Information Technologies and Systems (NGITS'99). R. Y. Pinter, S Tsur Editors, July 1999, Israel, pp. 190-202.
G. Posters/Demos
1.	Y. Tzitzikas, V. Christophides, G. Flouris, D. Kotzinos, H. Markkanen, D. Plexousakis, N. Spyratos, "Trialogical E-Learning and Emergent Knowledge Artifacts", 1st European Conference on Technology Enhanced Learning (EC-TEL'06), October 1-4, 2006, Heraklion Crete, Greece.
2.	G. Kokkinidis, L. Sidirourgos, V. Christophides, T. Dalamagas, T. Sellis, and S. Viglas, "P2P Digital Libraries", Poster Session of the 9th European Conference on Research and Advanced Technology for Digital Libraries (ECDL’05), September 18-23 2005, Vienna, Austria.
3.	S. Alexaki, N. Athanasi, V. Christophides, G. Karvounarakis, A. Magkanaraki, D. Plexousakis, and K. Tolle, "The ICS-FORTH RDFSuite: High-level Scalable Tools for the Semantic Web", Poster Session of the Eleventh International World Wide Web Conference (WWW'02), May 8 2002, Honolulu, Hawaii, USA.
4.	A. Michard, V. Christophides. "The Aquarelle Resource Discovery System". In Proc. of the ERCIM Digital Libraries (ECDL'98), September 1998, Heraklion, Crete, Greece.
5.	S. Abiteboul, B. Amann, S. Amer-Yahia, E. Carsenat, V. Christophides, S. Cluet, C. Delobel, M. Scholl, J. Simeon, F. Watter. "Data Integration and Interrogation". In Proc. of the 1997 Int. Conf. on Data Engineering (ICDE’97), April 1997, Birmingham, U.K, pp 588. 
H. Other Publications
1.	P. Georgiadis,  V. Christophides, G. Koutrika, Y. Ioannidis and C. Meghini "Preference Profile Integration in Digital Library Federations, or how to fuse scores with orders". Second DELOS Conference on Digital Libraries, December 2007, Tirrenia, Pisa, Italy.
2.	D. Giaretta, L. Fusco, S. Ross, M. Guercio, M. Hernandez, U. Di Giammatteo, Z. Bjelogrlic, D. Naor, C. Meghini, S. Boi, D. Terrgui, K. Ng, L. Briguglio, V. Christophides, B. Bachimont, H. Vinet, P. Sedlak, "CASPAR project and the validation of digital preservation techniques".  Ensuring the Long-Term Preservation and Value Adding to Scientific and Technical Data (PV’07), October 2007, DLR, Oberpfaffenhofen/Munich, Germany.
3.	S. Viglas, T. Dalamagas, V. Christophides, T. Sellis, A. Dimitriou, "Application of the Peer-to-Peer Paradigm in Digital Libraries". First DELOS Conference on Digital Libraries, February 2007 Tirrenia, Pisa, Italy, Springer-Verlag. 
4.	K. Keenoy, A. Poulovassilis, G. Papamarkos, P. T. Wood, V. Christophides, A. Magkanaraki, M. Stratakis, P. Rigaux, N. Spyratos, "Adaptive Personalisation in Self e-Learning Networks", First International Kaleidoscope Learning Grid SIG Workshop on Distributed e-Learning Environments, March 14, 2005, Napoli, Italy.
5.	V. Christophides, I. Koffina, G. Serfiotis, V. Tannen, A. Deutsch, "Integrating XML Data Sources using RDF/S Schemas: The ICS-FORTH Semantic Web Integration Middleware (SWIM)", In Seminar on Semantic Interoperability and Integration, Y. Kalfoglou, M. Schorlemmer, A. Sheth, S. Staab, M. Uschold editors, September 2004, Dagstuhl Germany.
6.	V. Christophides, D. Plexousakis, "Database Technology for the Semantic Web". In NSF-EU Strategic Workshop on the Semantic Web (SWSW), October 2001, Nice, France, INRIA Sophia-Antipolis.
7.	V. Christophides, S. Cluet, J. Simeon, "Optimization Techniques for Semistructured Integration Systems".  In Workshop on Foundations for Information Integration. S. Abiteboul, D. Florescu, A. Levy, G. Moerkotte editors, June 1999, Dagstuhl Germany.
8.	B. Birmingham, K. Bohm, V. Christophides, S. Cluet, A. Crespo, D. Kiskis, B. Leiner, C. Meghini, F. Rabitti, U. Roehm, H. J. Schek, H. Schuldt, P. Weinstein, P. Constantopoulos, "Interoperability between Digital Libraries". EU-NSF Digital Library Working Group on Interoperability between Digital Libraries, January 1999.
9.	C. Houstis, C. Nikolaou, S. Lalis, S. Kapidakis, V. Christophides, "Open Scientific Data Repositories Architecture". In NSF DICPM'98 Invitational Workshop on Distributed Information, Computation, and Process Management for Scientific and Engineering Environments (DICPM), May 1998, Hyatt Dulles, Herndon, Virginia.
I. Work in Progress
1.	Y. Rousakis, G. Flouris, V. Christophides, "Declarative Repairing Policies for Curated KBs"
2.	V. Papavassiliou, G. Flouris, I. Fundulaki, D. Kotzinos, V. Christophides, "High-Level Change Detection in RDF/S KBs"

CITATIONS
In overall, Vassilis Christophides received 3925 citations according to Google Scholar with a Hirsch's h-index 31 (or 1731 citations according to Microsoft Academic Research with an h-index 20). According to CiteSeer he is ranked in the 5184 position among the top 10000 authors over all areas in Computer Science. Reference E.27, rewarded with the 2004 SIGMOD Test of Time award, is ranked 106th in the list of the most cited papers published in informatics for 1994. The list of the ten most cited papers according to Google Scholar by excluding self-citations is:
•	E.19 (A9): Cited by 477 (449)
•	E.27: Cited by 400
•	F.13: Cited by 209 
•	E.22: Cited by 206
•	A.13: Cited by 168
•	E.14: Cited by 165
•	E.13: Cited by 81
•	E.15: Cited by 71
•	E.17: Cited by 61
•	E.7: Cited by 61
Last but not least, the majority of his research work has been produced in collaboration with M.S. and Ph.D students of the University of Crete financially supported by the Institute of Computer Science at FORTH.