P. Hasle. Proceedings of the 14th International Conference on Conceptual Structures (ICCS 2006), том 4068 из Lecture Notes in Computer Science, стр. 2-21. Springer, (2006)
C. Carpineto. Proceedings of the 10th International Conference on Conceptual Structures (ICCS 2002), том 2393 из Lecture Notes in Computer Science, стр. 1. Springer, (2002)