T. Cao, and A. Mai. Proceedings of the 18th International Conference on Conceptual Structures (ICCS 2010), volume 6208 of Lecture Notes in Computer Science, page 70-83. Springer, (2010)
A. Majumdar, J. Sowa, and J. Stewart. Proceedings of the 16th International Conference on Conceptual Structures (ICCS 2008), volume 5113 of Lecture Notes in Computer Science, page 21-42. Springer, (2008)
R. Wille, and R. Wille-Henning. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), volume 4604 of Lecture Notes in Artificial Intelligence, page 269-282. Berlin, Heidelberg, Springer-Verlag, (July 2007)