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  1. Rough sets.Zdzislaw Pawlak, Jerzy Grzymala-Busse, Roman Slowinski & Wojciech Ziarko - 1995 - Commun. Acm 38 (11):88--95.
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  • The Foundations of Mathematics.Charles Parsons & Evert W. Beth - 1961 - Philosophical Review 70 (4):553.
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  • Proof Methods for Modal and Intuitionistic Logics.Melvin Fitting - 1985 - Journal of Symbolic Logic 50 (3):855-856.
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