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  1. An incompleteness theorem in modal logic.S. K. Thomason - 1974 - Theoria 40 (1):30-34.
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  • An essay in classical modal logic.Krister Segerberg - 1971 - Uppsala,: Filosofiska foĢˆreningen och Filosofiska institutionen vid Uppsala universitet.
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  • Five critical modal systems.L. Esakia & V. Meskhi - 1977 - Theoria 43 (1):52-60.
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