Erik Pogalin André Redert Ioannis Patras Emile A. Hendriks Gaze Tracking by Using Factorized Likelihoods Particle Filtering and Stereo Vision. 57-64 2006 conf/3dpvt/2006 3DPVT http://doi.ieeecomputersociety.org/10.1109/3DPVT.2006.66 db/conf/3dpvt/3dpvt2006.html#PogalinRPH06