T. Ruotsalo, and E. Hyvönen. Proceedings of the 6th International Semantic Web Conference and 2nd Asian Semantic Web Conference (ISWC/ASWC2007), Busan, South Korea, volume 4825 of LNCS, page 407--420. Berlin, Heidelberg, Springer Verlag, (November 2007)
P. Dobrev, O. Kalaydjiev, and G. Angelova. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), volume 4604 of Lecture Notes in Artificial Intelligence, page 192-205. Berlin, Heidelberg, Springer-Verlag, (July 2007)