H. Bunt, M. Kipp, M. Maybury, und W. Wahlster. Multimodal Intelligent Information Presentation, Volume 27 von Text, Speech and Language Technology, Springer, Dordrecht, (2005)
R. op den Akker, H. Bunt, S. Keizer, und B. van Schooten. Proceedings of Interspeech 2005---Eurospeech: 9th European Conference on Speech Communication and Technology. Lisbon, Portugal, Seite 2793--2796. (2005)