D. Sonntag, N. Reithinger, G. Herzog, and T. Becker. Spoken Dialogue Systems for Ambient Environments: Second International Workshop, IWSDS 2010, Gotemba, Shizuoka, Japan, volume 6392 of Lecture Notes in Artificial Intelligence, Springer, Berlin, (2010)
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)