M. Johnston. Proceedings of the 11th International Conference on Multimodal Interfaces and the 6th Workshop on Machine Learning for Multimodal Interfaces (ICMI-MLMI '09), Cambridge, MA, USA, page 47-54. (2009)
D. Traum, and S. Larsson. Current and New Directions in Discourse and Dialogue, volume 22 of Text, Speech and Language Technology, Springer Netherlands, (2003)
R. Schaefer, S. Bleul, and W. Mueller. Engineering Human Computer Interaction and Interactive Systems, volume 3425 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2005)