W. Wahlster. KI 2003: Advances in Artificial Intelligence, 26th Annual German Conference on AI, KI 2003, Hamburg, Germany, volume 2821 of Lecture Notes in Artificial Intelligence, Springer, Berlin, (2003)
G. Skantze, and A. Hjalmarsson. Proceedings of the 11th Annual Meeting of the Special Interest Group on Discourse and Dialogue (SIGdial 2010), Tokyo, Japan, page 1-8. (2010)
X. Huang, and S. Oviatt. Machine Learning for Multimodal Interaction: Second International Workshop, MLMI 2005, Edinburgh, UK, July 11--13, 2005, Revised Selected Papers, volume 3869 of Lecture Notes in Computer Science, Springer, Berlin, (2006)