U. Priss, N. Jensen, и O. Rod. Proceedings of the 21th International Conference on Conceptual Structures (ICCS 2013), том 7735 из Lecture Notes in Computer Science, стр. 121-134. Springer, (2013)
B. Galitsky, и S. Kuznetsov. Proceedings of the 16th International Conference on Conceptual Structures (ICCS 2008), том 5113 из Lecture Notes in Computer Science, стр. 282-296. Springer, (2008)