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)
D. Sonntag, and P. Heim. Proceedings of the second International Conference on Semantic and Digital Media Technologies (SAMT 2007), page 158-171. Springer, (2007)