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  1. Modal companions of intermediate propositional logics.Alexander Chagrov & Michael Zakharyashchev - 1992 - Studia Logica 51 (1):49 - 82.
    This paper is a survey of results concerning embeddings of intuitionistic propositional logic and its extensions into various classical modal systems.
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  • The mathematics of metamathematics.Helena Rasiowa - 1963 - Warszawa,: Państwowe Wydawn. Naukowe. Edited by Roman Sikorski.
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  • (1 other version)Some Theorems About the Sentential Calculi of Lewis and Heyting.J. C. C. Mckinsey & Alfred Tarski - 1948 - Journal of Symbolic Logic 13 (3):171-172.
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  • An essay in classical modal logic.Krister Segerberg - 1971 - Uppsala,: Filosofiska föreningen och Filosofiska institutionen vid Uppsala universitet.
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  • Canonical formulas for k4. part I: Basic results.Michael Zakharyaschev - 1992 - Journal of Symbolic Logic 57 (4):1377-1402.
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