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E. J. Lemmon. An extension algebra and the modal system T. Notre Dame Journal of formal logic, vol. 1 (1960), pp. 3–12. - E. J. Lemmon. Algebraic semantics for modal logics. The journal of symbolic logic, vol. 31 (1966), pp. 46–65; pp. 191–218.
NobleIDNI1P31W21R08S15
Type:Journal Article
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