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M. Croitoru, B. Hu, S. Dasmahapatra, P. Lewis, D. Dupplaw, and L. Xiao. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), volume 4604 of Lecture Notes in Artificial Intelligence, page 140-153. Berlin, Heidelberg, Springer-Verlag, (July 2007)
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