Alice J. O'Toole Shimon Edelman Face distinctiveness in recognition across viewpoint: An analysis of the statistical structure of face spaces. 10-15 1996 conf/fgr/1996 FG http://doi.ieeecomputersociety.org/10.1109/AFGR.1996.557237 db/conf/fgr/fg1996.html#OTooleE96