J. Völker, D. Vrandecic, Y. Sure, and A. Hotho. Proceedings of the European Semantic Web Conference, ESWC2007, volume 4519 of Lecture Notes in Computer Science, Springer-Verlag, (July 2007)
S. Staab, J. Angele, S. Decker, A. Hotho, A. Maedche, H. Schnurr, R. Studer, and Y. Sure. AAAI 2000/IAAI 2000 - Proceedings of the 17th National Conference on Artificial Intelligence and 12th Innovative Applications of Artificial Intelligence Conference, Austin/TX, USA, July 30-August 3, 2000, AAAI Press/MIT Press, (2000)