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  1. Modal logic and the theory of modal aggregation.P. K. Schotch & R. E. Jennings - 1980 - Philosophia 9 (2):265-278.
  • Alternative postulate sets for Lewis's S.E. J. Lemmon - 1956 - Journal of Symbolic Logic 21 (4):347-349.
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  • Propositional calculus for contradictory deductive systems.Stanisław Jaśkowski - 1969 - Studia Logica 24 (1):143 - 160.