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)
D. Milward, and M. Beveridge. Proceedings of the 3rd IJCAI Workshop on Knowledge and Reasoning in Practical Dialogue Systems, Acapulco, Mexico, page 9-18. (2003)