B. Smith, and H. Delugach. Proceedings of the 14th International Conference on Conceptual Structures (ICCS 2006), volume 4068 of Lecture Notes in Computer Science, page 401-412. Springer, (2006)
J. Sowa. Proceedings of the 12th International Conference on Conceptual Structures (ICCS 2004), volume 3127 of Lecture Notes in Computer Science, page 31-51. Springer, (2004)
O. Alhabashneh, R. Iqbal, N. Shah, S. Amin, and A. James. Proceedings of the 19th International Conference on Conceptual Structures (ICCS 2011), volume 6828 of Lecture Notes in Computer Science, page 346-352. Springer, (2011)