KUNG, Sheng H; ZOHDY, Mohamed A.; BOUCHAFFRA, Djamel. 3D HMM-based Facial Expression Recognition using Histogram of Oriented Optical Flow. Transactions on Engineering and Computing Sciences, [S. l.], v. 3, n. 6, p. 42, 2016. DOI: 10.14738/tmlai.36.1661. Disponível em: https://scholarpublishing.org/journals/index.php/TECS/article/view/2365. Acesso em: 6 may. 2026.