P. Martin. Proceedings of the 11th International Conference on Conceptual Structures (ICCS 2003), volume 2746 of Lecture Notes in Computer Science, page 160-173. Springer, (2003)
I. Stalker, N. Mehandjiev, and M. Carpenter. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), volume 4604 of Lecture Notes in Artificial Intelligence, page 360-373. Berlin, Heidelberg, Springer-Verlag, (July 2007)
P. Martin, M. Blumenstein, and P. Deer. Proceedings of the 13th International Conference on Conceptual Structures (ICCS 2005), volume 3596 of Lecture Notes in Computer Science, page 411-424. Springer, (2005)