S. Rozsnyai, J. Schiefer, and A. Schatten. DEBS '07: Proceedings of the 2007 inaugural international conference on Distributed event-based systems, page 62--70. New York, NY, USA, ACM, (2007)
S. Kuznetsov, S. Obiedkov, and C. Roth. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), volume 4604 of Lecture Notes in Artificial Intelligence, page 241-254. Berlin, Heidelberg, Springer-Verlag, (July 2007)
S. Kuznetsov, S. Obiedkov, and C. Roth. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), volume 4604 of Lecture Notes in Artificial Intelligence, page 241-254. Berlin, Heidelberg, Springer-Verlag, (July 2007)
H. Pfeiffer, and J. Pfeiffer. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), volume 4604 of Lecture Notes in Artificial Intelligence, page 484-487. Berlin, Heidelberg, Springer-Verlag, (July 2007)