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  1. Propositional Logics Related to Heyting's and Johansson's.Krister Segerberg - 1968 - Theoria 34 (1):26-61.
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  • Some remarks on the consequence operation in sentential logics.Ryszard Wójcicki - 1970 - Fundamenta Mathematicae 68 (1):269--279.
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