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O. Kutz, and T. Mossakowski. Proceedings of the Twenty-Fifth AAAI Conference on Artificial Intelligence and the Twenty-Third Innovative Applications of Artificial Intelligence Conference, page 227-234. AAAI Press; Menlo Park, CA, (2011)
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A. van Delden, and T. Mossakowski. 36th Annual Conference on Artificial Intelligence (KI 2013), volume 8077 of Lecture Notes in Artificial Intelligence, page 248--259. Springer, (2013)