I. Nikolova, G. Angelova, D. Tcharaktchiev, und S. Boytcheva. Proceedings of the 21th International Conference on Conceptual Structures (ICCS 2013), Volume 7735 von Lecture Notes in Computer Science, Seite 106-120. Springer, (2013)
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)