B. Galitsky, B. Kovalerchuk, und S. Kuznetsov. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), Volume 4604 von Lecture Notes in Artificial Intelligence, Seite 387-400. Berlin, Heidelberg, Springer-Verlag, (Juli 2007)
B. Ganter, P. Grigoriev, S. Kuznetsov, und M. Samokhin. Proceedings of the 12th International Conference on Conceptual Structures (ICCS 2004), Volume 3127 von Lecture Notes in Computer Science, Seite 94-108. Springer, (2004)