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This paper is a sequel of the paperA formalization of the modal propositional S4 calculus, Studia Logica XXVII, 1971.
Allatum est die 5 Februarii 1971
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Wasilewska, A. The diagrams of formulas of the modal propositional S4* calculus. Stud Logica 30, 69–76 (1972). https://doi.org/10.1007/BF02120833
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DOI: https://doi.org/10.1007/BF02120833