J. Sowa. Proceedings of the 14th International Conference on Conceptual Structures (ICCS 2006), том 4068 из Lecture Notes in Computer Science, стр. 54-69. Springer, (2006)
M. Northover, A. Boake, и D. Kourie. Proceedings of the 14th International Conference on Conceptual Structures (ICCS 2006), том 4068 из Lecture Notes in Computer Science, стр. 360-373. Springer, (2006)