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  1. On Ł ukasiewicz's ${\rm \L}$-modal system.Timothy Smiley - 1961 - Notre Dame Journal of Formal Logic 2 (3):149-153.
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  • (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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  • (2 other versions)Set Theory and Logic.G. T. Kneebone - 1964 - Journal of Symbolic Logic 29 (1):40-41.
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  • (3 other versions)Symbolic Logic.C. I. Lewis & C. H. Langford - 1932 - Erkenntnis 4 (1):65-66.
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  • (1 other version)Modal Logics Between S 4 and S 5.M. A. E. Dummett & E. J. Lemmon - 1959 - Mathematical Logic Quarterly 5 (14-24):250-264.
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  • (1 other version)An extension algebra and the modal system ${\rm T}$.E. J. Lemmon - 1960 - Notre Dame Journal of Formal Logic 1 (1-2):3-12.
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  • (4 other versions)Formal Logic.A. N. Prior - 1964 - Studia Logica 15:298-301.
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