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    On superintuitionistic logics as fragments of proof logic extensions.A. V. Kuznetsov & A. Yu Muravitsky - 1986 - Studia Logica 45 (1):77 - 99.
    Coming fromI andCl, i.e. from intuitionistic and classical propositional calculi with the substitution rule postulated, and using the sign to add a new connective there have been considered here: Grzegorozyk's logicGrz, the proof logicG and the proof-intuitionistic logicI set up correspondingly by the calculiFor any calculus we denote by the set of all formulae of the calculus and by the lattice of all logics that are the extensions of the logic of the calculus, i.e. sets of formulae containing the axioms (...)
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