C. Pradel, O. Haemmerlé, und N. Hernandez. Proceedings of the 19th International Conference on Conceptual Structures (ICCS 2011), Volume 6828 von Lecture Notes in Computer Science, Seite 229-242. Springer, (2011)
I. Nikolova, und G. Angelova. Proceedings of the 19th International Conference on Conceptual Structures (ICCS 2011), Volume 6828 von Lecture Notes in Computer Science, Seite 173-186. Springer, (2011)