S. Ghosh, B. Löwe, and E. Scorelle. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), volume 4604 of Lecture Notes in Artificial Intelligence, page 401-414. Berlin, Heidelberg, Springer-Verlag, (July 2007)
G. Malik. Proceedings of the 12th International Conference on Conceptual Structures (ICCS 2004), volume 3127 of Lecture Notes in Computer Science, page 213-226. Springer, (2004)
Y. Kalfoglou, and W. Schorlemmer. Proceedings of the 13th International Conference on Conceptual Structures (ICCS 2005), volume 3596 of Lecture Notes in Computer Science, page 107-118. Springer, (2005)