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  1. Negative Equivalence of Extensions of Minimal Logic.Sergei P. Odintsov - 2004 - Studia Logica 78 (3):417-442.
    Two logics L1 and L2 are negatively equivalent if for any set of formulas X and any negated formula ¬, ¬ can be deduced from the set of hypotheses X in L1 if and only if it can be done in L2. This article is devoted to the investigation of negative equivalence relation in the class of extensions of minimal logic.
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  • On the Structure of Paraconsistent Extensions of Johansson's Logic.Sergei P. Odintsov - 2005 - Journal of Applied Logic 3 (1):43-65.