Nils J. Nilsson. The Physical Symbol System Hypothesis: Status and Prospects. In Max Lungarella, Fumiya Iida, Josh C. Bongard, Rolf Pfeifer, editors, 50 Years of Artificial Intelligence, Essays Dedicated to the 50th Anniversary of Artificial Intelligence. Volume 4850 of Lecture Notes in Computer Science, pages 9-17, Springer, 2006. [doi]
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