M. Krötzsch, D. Vrande�?ić, and M. Völkel. The Semantic Web - ISWC 2006, volume 4273 of Lecture Notes in Computer Science, page 935--942. Heidelberg, DE, Springer, (2006)
S. Auer, S. Dietzold, and T. Riechert. The Semantic Web - ISWC 2006, 5th International Semantic, volume 4273 of Lecture Notes in Computer Science, page 736-749. Springer, (2006)
S. Schaffert, J. Eder, S. Grünwald, T. Kurz, and M. Radulescu. ESWC'09: The Semantic Web: Research and Applications, Proceedings of the 6th European Semantic Web Conference, page 888-892. Heraklion, Greece, (June 2009)