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  1. 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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  • Categorical Foundations and Foundations of Category Theory.Solomon Feferman - 1980 - In R. E. Butts & J. Hintikka (eds.), Logic, Foundations of Mathematics, and Computability Theory. Springer. pp. 149-169.
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