R. Pieraccini, and J. Huerta. Recent Trends in Discourse and Dialogue, volume 39 of Text, Speech and Language Technology, chapter 1, Springer, Dordrecht, (2008)
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)
R. Pieraccini, and D. Lubensky. Innovations in Applied Artificial Intelligence: 18th International Conference on Industrial and Engineering Applications of Artificial Intelligence and Expert Systems, IEA/AIE 2005, Bari, Italy, volume 3533 of Lecture Notes in Artificial Intelligence, Springer, Berlin, (2005)