1. The Expression of the Emotions in Man and Animals;Darwin,1872
2. Constants across cultures in the face and emotion;Ekman;J. Personality Social Psychol.,1971
3. M. Suwa, N. Sugie, K. Fujimora, A preliminary note on pattern recognition of human emotional expression, Proceedings of the Fourth International Joint Conference on Pattern Recognition, Kyoto, Japan, 1978, pp. 408–410.
4. Recognition of facial expression from optical flow;Mase;IEICE Trans. E,1991
5. Review of objective topographic facial nerve evaluation methods;Dulguerov;Am. J. Otol.,1999