R. Duque, C. Bravo, and M. Ortega. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), volume 4604 of Lecture Notes in Artificial Intelligence, page 509-512. Berlin, Heidelberg, Springer-Verlag, (July 2007)
B. Ganter, and G. Stumme. Proceedings of the 11th International Conference on Conceptual Structures (ICCS 2003), volume 2746 of Lecture Notes in Computer Science, page 131-145. Springer, (2003)
M. Hacene, P. Valtchev, and R. Nkambou. Proceedings of the 19th International Conference on Conceptual Structures (ICCS 2011), volume 6828 of Lecture Notes in Computer Science, page 257-269. Springer, (2011)
I. Stalker, N. Mehandjiev, and M. Carpenter. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), volume 4604 of Lecture Notes in Artificial Intelligence, page 360-373. Berlin, Heidelberg, Springer-Verlag, (July 2007)