Benjamin B. Kimia Amir Tamrakar The Role of Propagation and Medial Geometry in Human Vision. 219-229 2002 conf/bmcv/2002 Biologically Motivated Computer Vision http://link.springer.de/link/service/series/0558/bibs/2525/25250219.htm db/conf/bmcv/bmcv2002.html#KimiaT02