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  1. Natural Deduction: A Proof-Theoretical Study.Richmond Thomason - 1965 - Journal of Symbolic Logic 32 (2):255-256.
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  • A System for Strict Implication.Masao Ohnishi & Kazuo Matsumoto - 1964 - Annals of the Japan Association for Philosophy of Science 2 (4):183-188.
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  • Tautological entailments.Alan Ross Anderson & Nuel D. Belnap - 1962 - Philosophical Studies 13 (1-2):9 - 24.
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  • Foundations of Mathematical Logic.William Craig - 1963 - Journal of Symbolic Logic 45 (2):377-378.
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