2 | Ilkka Niemelä and H. Tuominen. A system for logical expertise. In Proceedings of the Finnish Artificial Intelligence Symposium, Volume 2, pages 44–53, Espoo, Finland, August 1986. Finnish Society of Information Processing Science. |
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1 | Ilkka Niemelä. A survey of nonmonotonic logic (in Finnish). Internal report A22, Helsinki University of Technology, Digital Systems Laboratory, Espoo, 1986. |
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