1. Allen, J., Byron, D., Dzikovska, M., Ferguson, G., Galescu, L., Stent, A.: Towards conversational human-computer interaction. AI Magazine 22(4), 27–37 (2001)
2. Cassell, J., Bickmore, T., Billinghurst, M., Campbell, L., Chang, K., Vilhjalmsson, H., Yan, H.: Embodiment in conversational interfaces: Rea. In: Proceedings of the CHI 1999 Conference, pp. 520–527 (1999)
3. Lecture Notes in Artificial Intelligence;P. Gebhard,2001
4. Lenzo, K.A., Black, A.W.: (2002),
http://www.speech.cs.cmu.edu/ite/
5. Nitchie, E.B.: How to Read Lips for Fun and Profit. Hawthorne Books, New York (1979)