R. II, und P. Eklund. Proceedings of the 9th International Conference on Conceptual Structures (ICCS 2001), Volume 2120 von Lecture Notes in Computer Science, Seite 319-332. Springer, (2001)
R. Cole, und P. Eklund. Proceedings of the 9th International Conference on Conceptual Structures (ICCS 2001), Volume 2120 von Lecture Notes in Computer Science, Seite 319-332. Springer, (2001)