Carlos Hitoshi Morimoto Arnon Amir Myron Flickner Detecting Eye Position and Gaze from a Single Camera and 2 Light Sources. 314-317 2002 ICPR (4) http://doi.ieeecomputersociety.org/10.1109/ICPR.2002.1047459 db/conf/icpr/icpr2002-4.html#MorimotoAF02