G. Richmond. Proceedings of the 13th International Conference on Conceptual Structures (ICCS 2005), Volume 3596 von Lecture Notes in Computer Science, Seite 453-466. Springer, (2005)
G. Richmond. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), Volume 4604 von Lecture Notes in Artificial Intelligence, Seite 15-28. Berlin, Heidelberg, Springer-Verlag, (Juli 2007)