S. Auer, and J. Lehmann. The Semantic Web: Research and Applications, 4th European Semantic Web Conference, ESWC 2007, Innsbruck, Austria, volume 4519 of Lecture Notes in Computer Science, Springer, Berlin, (2007)
S. Auer, and J. Lehmann. ESWC '07: Proceedings of the 4th European conference on The Semantic Web, page 503--517. Berlin, Heidelberg, Springer-Verlag, (2007)