This is a paper describing mahotas.
This is now published:
Coelho, L.P. 2013. Mahotas: Open source software for scriptable computer vision. Journal of Open Research Software 1(1):e3, DOI: http://dx.doi.org/10.5334/jors.ac
In BibTeX format:
@article{coelho:mahotas, title = {Mahotas: Open source software for scriptable computer vision}, author = {Luis Pedro Coelho}, journal = {Journal of Open Research Software}, year = {2013}, volume = {1}, doi = {10.5334/jors.ac}, url = {http://doi.org/10.5334/jors.ac} }