A. Batliner, C. Hacker, M. Kaiser, H. Mögele, and E. Nöth. Proceedings of AVSP'07: International Conference on Auditory-Visual Speech Processing, Kasteel Groenendaal, Hilvarenbeek, The Netherlands, (2007)
D. Anicic, and N. Stojanovic. Intelligent Event Processing, Papers from the 2009 AAAI Spring Symposium, SS-09-05, page 14--20. Menlo Park, CA, AAAI Press, (2009)