If you use sparseLM in your published work, you should include a reference to the following paper (bibtex entry):
@inproceedings{lourakis10,
author = {Manolis I.A. Lourakis},
title = {Sparse Non-linear Least Squares Optimization for Geometric Vision},
booktitle = {European Conference on Computer Vision},
volume = {2},
year = {2010},
pages = {43-56},
doi = {http://dx.doi.org/10.1007/978-3-642-15552-9_4},
}