P. Øhrstrøm, H. Schärfe, and S. Uckelman. Proceedings of the 16th International Conference on Conceptual Structures (ICCS 2008), volume 5113 of Lecture Notes in Computer Science, page 74-87. Springer, (2008)
M. Morneau, and G. Mineau. Proceedings of the 16th International Conference on Conceptual Structures (ICCS 2008), volume 5113 of Lecture Notes in Computer Science, page 242-254. Springer, (2008)
R. Bendaoud, Y. Toussaint, and A. Napoli. Proceedings of the 16th International Conference on Conceptual Structures (ICCS 2008), volume 5113 of Lecture Notes in Computer Science, page 203-216. Springer, (2008)