B. Motik. Proceedings of the 18th International Conference on Conceptual Structures (ICCS 2010), volume 6208 of Lecture Notes in Computer Science, page 10-12. Springer, (2010)
J. Metzger, F. Ber, and A. Napoli. Proceedings of the 11th International Conference on Conceptual Structures (ICCS 2003), volume 2746 of Lecture Notes in Computer Science, page 215-228. Springer, (2003)