S. Ferré, и O. Ridoux. Proceedings of the 9th International Conference on Conceptual Structures (ICCS 2001), том 2120 из Lecture Notes in Computer Science, стр. 187-201. Springer, (2001)
K. Wolff. Proceedings of the 13th International Conference on Conceptual Structures (ICCS 2005), том 3596 из Lecture Notes in Computer Science, стр. 250-266. Springer, (2005)