Iordanis Mpiperis Sotiris Malassiotis Michael G. Strintzis Bilinear elastically deformable models with application to 3D face and facial expression recognition. 1-8 2008 FG http://dx.doi.org/10.1109/AFGR.2008.4813333 conf/fgr/2008 db/conf/fgr/fg2008.html#MpiperisMS08