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  1. (1 other version)Semantical Analysis of Modal Logic I. Normal Propositional Calculi.Saul A. Kripke - 1963 - Zeitschrift fur mathematische Logik und Grundlagen der Mathematik 9 (5‐6):67-96.
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  • Combinatory Logic.Haskell B. Curry, J. Roger Hindley & Jonathan P. Seldin - 1977 - Journal of Symbolic Logic 42 (1):109-110.
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  • Natural Deduction Rules for Obligation.Frederic B. Fitch - 1966 - American Philosophical Quarterly 3 (1):27 - 38.
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  • Knowledge and Belief: An Introduction to the Logic of the Two Notions.Alan R. White - 1965 - Philosophical Quarterly 15 (60):268.
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