D. Ignatov, и S. Kuznetsov. Proceedings of the 17th International Conference on Conceptual Structures (ICCS 2009), том 5662 из Lecture Notes in Computer Science, стр. 185-200. Springer, (2009)
J. Balcázar, A. Bifet, и A. Lozano. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), том 4604 из Lecture Notes in Artificial Intelligence, стр. 347-359. Berlin, Heidelberg, Springer-Verlag, (июля 2007)