Michael Gelfond and Vladimir Lifschitz. The stable model semantics for logic programming. Logic programming, Proceedings of the fifth international conference and symposium, Volume 2, edited by Robert A. Kowalski and Kenneth A. Bowen, Series in logic programming, The MIT Press, Cambridge, Mass., and London, 1988, pp. 1070–1080. - Kit Fine. The justification of negation as failure. Logic, methodology and philosophy of science VIII, Proceedings of the Eighth International Congress of Logic, Methodology and Philosophy of Science, Moscow, 1987, edited by Jens Erik Fenstad, Ivan T. Frolov, and Risto Hilpinen, Studies in logic and the foundations of mathematics, vol. 126, North-Holland, Amsterdam etc. 1989, pp. 263–301.

1992 ◽  
Vol 57 (1) ◽  
pp. 274-277
Author(s):  
Melvin Fitting
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