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)
Y. Wang, and S. Hamerich. Recent Trends in Discourse and Dialogue, volume 39 of Text, Speech and Language Technology, chapter 2, Springer, Dordrecht, (2008)
Y. Wang, S. Hamerich, M. Hennecke, and V. Schubert. Proceedings of the 6th Workshop of the Special Interest Group on Discourse and Dialogue (SIGdial 2005), Lisbon, Portugal, page 217--221. (2005)