P. Øhrstrøm, H. Schärfe, и S. Uckelman. Proceedings of the 16th International Conference on Conceptual Structures (ICCS 2008), том 5113 из Lecture Notes in Computer Science, стр. 74-87. Springer, (2008)
F. Southey, и J. Linders. Proceedings of the 9th International Conference on Conceptual Structures (ICCS 2001), том 2120 из Lecture Notes in Computer Science, стр. 333-345. Springer, (2001)