Biundo, Susanne (ed.) et al., KI 2004: Advances in artificial intelligence. 27th annual German conference in AI, KI 2004, Ulm, Germany, September 20–24, 2004, Proceedings. Berlin: Springer (ISBN 978-3-540-23166-0/pbk). Lecture Notes in Computer Science 3238. Lecture Notes in Artificial Intelligence, 3-28 (2004).