Alexander M. Bronstein Michael M. Bronstein Alfred M. Bruckstein Ron Kimmel Partial Similarity of Objects, or How to Compare a Centaur to a Horse. 163-183 2009 84 International Journal of Computer Vision 2 http://dx.doi.org/10.1007/s11263-008-0147-3 db/journals/ijcv/ijcv84.html#BronsteinBBK09