J. Völker, D. Vrandecic, and Y. Sure. Proceedings of the 4th International Semantic Web Conference (ISWC'05), volume 3729 of LNCS, page 716--731. Galway, Ireland, Springer, (November 2005)
D. Vrandecic, and Y. Sure. The Semantic Web: Research and Applications --- Proceedings of the 4th European Semantic Web Conference (ESWC 2007), June 3-7, 2007, Innsbruck, Austria, volume 4519 of Lecture Notes in Computer Science, page 311--325. Springer, Berlin--Heidelberg, Germany, (2007)