Li, Xiaoli, Qiuqi Ruan, Gaoyun An, and Yi Jin. “Analysis of Range Images Used in 3D Facial Expression Recognition Systems”. Computing and Informatics 35, no. 1 (May 31, 2016): 203–221. Accessed November 8, 2024. http://147.213.75.17/ojs/index.php/cai/article/view/1207.