F. Dau, J. Ducrou, и P. Eklund. Proceedings of the 16th International Conference on Conceptual Structures (ICCS 2008), том 5113 из Lecture Notes in Computer Science, стр. 255-268. Springer, (2008)
M. Croitoru, B. Hu, S. Dasmahapatra, P. Lewis, D. Dupplaw, и L. Xiao. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), том 4604 из Lecture Notes in Artificial Intelligence, стр. 154-165. Berlin, Heidelberg, Springer-Verlag, (июля 2007)