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"A Simple Geometric-Based Descriptor for Facial Expression Recognition" (2017) Acevedo, D.;Negri, P.;Buemi, M.E. (...)3dMD; Baidu; DI4D; et al.; Mitsubishi Electric Research Laboratories, Inc; NSF 12th IEEE International Conference on Automatic Face and Gesture Recognition, FG 2017:802-808