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  1. Hypothesis generation by machine.Charles G. Morgan - 1971 - Artificial Intelligence 2 (2):179-187.
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  • Completeness and decidability of three logics of counterfactual conditionals.David Lewis - 1971 - Theoria 37 (1):74-85.
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  • (3 other versions)An introduction to modal logic.G. E. Hughes - 1968 - London,: Methuen. Edited by M. J. Cresswell.
    Modal propositional logic; Modal predicate logic; A survey of modal logic.
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  • Sentential calculus for logical falsehoods.Charles G. Morgan - 1973 - Notre Dame Journal of Formal Logic 14 (3):347-353.
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