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  1. On the theory of inconsistent formal systems.Newton C. A. da Costa - 1974 - Notre Dame Journal of Formal Logic 15 (4):497-510.
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  • On the theory of inconsistent formal systems.Newton C. A. Costa - 1972 - Recife,: Universidade Federal de Pernambuco, Instituto de Matemática.
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  • Discussive sentential calculus of Jaśkowski.Jerzy Kotas - 1975 - Studia Logica 34 (2):149-168.
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  • (2 other versions)Logic for Mathematicians.A. Robinson - 1953 - Journal of Symbolic Logic 18 (4):326-327.
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  • alpha-models and systems T and T.Newton C. A. da Costa - 1974 - Notre Dame Journal of Formal Logic 15:443.
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  • On the Jaśkowski's method of suppositions.Ewa Orłowska - 1975 - Studia Logica 34 (2):187-200.
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