S. Obiedkov, D. Kourie, and J. Eloff. Proceedings of the 14th International Conference on Conceptual Structures (ICCS 2006), volume 4068 of Lecture Notes in Computer Science, page 374-387. Springer, (2006)
J. Sarbo, and J. Farkas. Proceedings of the 10th International Conference on Conceptual Structures (ICCS 2002), volume 2393 of Lecture Notes in Computer Science, page 20-33. Springer, (2002)
M. Popovici, M. Muraru, A. Agache, C. Giumale, L. Negreanu, and C. Dobre. Proceedings of the 19th International Conference on Conceptual Structures (ICCS 2011), volume 6828 of Lecture Notes in Computer Science, page 215-228. Springer, (2011)