1. Cowie, R., Douglas-Cowie, E., Tsapatsoulis, N., Votsis, G., Kollias, S., Fellenz, W., Taylor, J.: Emotion Recognition in Human-Computer Interaction. IEEE Signal Processing Magazine, 32–80 (2001)
2. DeCarolis, B., Pelachaud, C., Poggi, I., Steedman, M.: APML, A mark-up language for believable behavior generation, Life-Like Characters. Springer, Heidelberg (2004)
3. EC TMR Project PHYSTA Report: Review of Existing Techniques for Human Emotion Understanding and Applications in Human-Computer Interaction (1998),
http://www.image.ece.ntua.gr/physta/reports/emotionreview.htm
4. Ekman, P.: Facial expression and Emotion. Am. Psychologist 48, 384–392 (1993)
5. Hartmann, B., Mancini, M., Pelachaud, C.: Formational parameters and adaptive prototype instantiation for MPEG-4 compliant gesture synthesis. Computer Animation, 111. 3, 6, 7 (2002)