G. Aissaoui, D. Genest, und S. Loiseau. Proceedings of the 11th International Conference on Conceptual Structures (ICCS 2003), Volume 2746 von Lecture Notes in Computer Science, Seite 337-350. Springer, (2003)
L. Harper, und H. Delugach. Proceedings of the 11th International Conference on Conceptual Structures (ICCS 2003), Volume 2746 von Lecture Notes in Computer Science, Seite 392-404. Springer, (2003)