1. E. A. Haggard and K. S. Isaacs. 1966. "Micromomentary facial expressions as indicators of ego mechanisms in psychotherapy," in Methods of Research in Psychotherapy, Springer, pp. 154--165.
2. P. Ekman. 2002. Micro Expression training tool (METT), San Francisco: University of California.
3. Yan W J, Li X B, Wang S J, Zhao G Y, Liu Y J, Chen Y H and Fu X L. 2014. CASME II: An improved spontaneous micro-expression database and the baseline evaluation. PLoS One, 9(1): e86041
4. X. Li, T. Pfister, X. Huang, G. Zhao, and M. Pietik¨ainen. 2013. "A spontaneous micro-expression database: Inducement, collection and baseline," In Proc. AFGR, 2013:1--6.
5. Polikovsky, Senya, Y. Kameda, and Y. Ohta. 2010. "Facial micro-expressions recognition using high speed camera and 3D-gradient descriptor," International Conference on Crime Detection and Prevention IET, 1--6.