I. Nikolova, and G. Angelova. Proceedings of the 19th International Conference on Conceptual Structures (ICCS 2011), volume 6828 of Lecture Notes in Computer Science, page 173-186. Springer, (2011)
G. Angelova, S. Boytcheva, and D. Tcharaktchiev. Proceedings of the 19th International Conference on Conceptual Structures (ICCS 2011), volume 6828 of Lecture Notes in Computer Science, page 298-303. Springer, (2011)
G. Angelova. Proceedings of the 18th International Conference on Conceptual Structures (ICCS 2010), volume 6208 of Lecture Notes in Computer Science, page 14-27. Springer, (2010)
S. Boytcheva, and G. Angelova. Proceedings of the 17th International Conference on Conceptual Structures (ICCS 2009), volume 5662 of Lecture Notes in Computer Science, page 100-113. Springer, (2009)