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  1. Note on a property of matrices for Lewis and Langford's calculi of propositions.James Dugundji - 1940 - Journal of Symbolic Logic 5 (4):150-151.
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  • A useful four-valued logic.N. D. Belnap - 1977 - In J. M. Dunn & G. Epstein (eds.), Modern Uses of Multiple-Valued Logic. D. Reidel.
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  • Modal Logic.Patrick Blackburn, Maarten de Rijke & Yde Venema - 2001 - Studia Logica 76 (1):142-148.
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  • A System of Modal Logic.Jan Łukasiewicz - 1953 - Proceedings of the XIth International Congress of Philosophy 14:82-87.
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  • O logice trójwartościowej.Jan Łukasiewicz - 1988 - Studia Filozoficzne 270 (5).
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