Alessandro Colombo Claudio Cusano Raimondo Schettini Detection and Restoration of Occlusions for 3D Face Recognition. 1541-1544 2006 conf/icmcs/2006 ICME http://doi.ieeecomputersociety.org/10.1109/ICME.2006.262837 db/conf/icmcs/icme2006.html#ColomboCS06a