A. Kabbaj, B. Moulin, J. Gancet, D. Nadeau, und O. Rouleau. Proceedings of the 9th International Conference on Conceptual Structures (ICCS 2001), Volume 2120 von Lecture Notes in Computer Science, Seite 346-359. Springer, (2001)
A. Kabbaj. Proceedings of the 14th International Conference on Conceptual Structures (ICCS 2006), Volume 4068 von Lecture Notes in Computer Science, Seite 286-299. Springer, (2006)