Boqing Gong Yueming Wang Jianzhuang Liu Xiaoou Tang Automatic facial expression recognition on a single 3D face by exploring shape deformation. 569-572 2009 ACM Multimedia http://doi.acm.org/10.1145/1631272.1631358 conf/mm/2009 db/conf/mm/mm2009.html#GongWLT09