T. Groza, S. Handschuh, K. Möller, and S. Decker. Proceedings of the 5th European Semantic Web Conference, Berlin, Heidelberg, Springer Verlag, (June 2008)
S. Shum. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), volume 4604 of Lecture Notes in Artificial Intelligence, page 29-44. Berlin, Heidelberg, Springer-Verlag, (July 2007)