Christoph Bussler, John Davies, Dieter Fensel, Rudi Studer: The Semantic Web: Research and Applications, First European Semantic Web Symposium, ESWS 2004, Heraklion, Crete, Greece, May 10-12, 2004, Proceedings. Lecture Notes in Computer Science 3053, Springer 2004, ISBN 3-540-21999-4