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  1. The Logic of Contradiction.Nicolas D. Goodman - 1981 - Mathematical Logic Quarterly 27 (8-10):119-126.
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  • A remark on Gentzen's calculus of sequents.Johannes Czermak - 1977 - Notre Dame Journal of Formal Logic 18 (3):471-474.
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  • The Logic of Contradiction.Nicolas D. Goodman - 1981 - Mathematical Logic Quarterly 27 (8‐10):119-126.
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  • Investigations into Logical Deduction.Gerhard Gentzen, M. E. Szabo & Paul Bernays - 1970 - Journal of Symbolic Logic 35 (1):144-145.
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