M. Croitoru, B. Hu, S. Dasmahapatra, P. Lewis, D. Dupplaw, und L. Xiao. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), Volume 4604 von Lecture Notes in Artificial Intelligence, Seite 140-153. Berlin, Heidelberg, Springer-Verlag, (Juli 2007)
M. Croitoru, B. Hu, S. Dasmahapatra, P. Lewis, D. Dupplaw, und L. Xiao. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), Volume 4604 von Lecture Notes in Artificial Intelligence, Seite 154-165. Berlin, Heidelberg, Springer-Verlag, (Juli 2007)