Andreas Stergiou Ghassan Karame Aristodemos Pnevmatikakis Lazaros Polymenakos The AIT 2D Face Detection and Tracking System for CLEAR 2007. 113-125 2007 CLEAR http://dx.doi.org/10.1007/978-3-540-68585-2_9 conf/clear/2007 db/conf/clear/clear2007.html#StergiouKPP07