Tianhong Fang Xi Zhao 0001 Omar Ocegueda Shishir K. Shah Ioannis A. Kakadiaris 3D facial expression recognition: A perspective on promises and challenges. 603-610 2011 FG https://doi.org/10.1109/FG.2011.5771466 https://doi.ieeecomputersociety.org/10.1109/FG.2011.5771466 conf/fgr/2011 db/conf/fgr/fg2011.html#FangZOSK11