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  1. A system of natural deduction for GL.Gianluigi Bellin - 1985 - Theoria 51 (2):89-114.
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  • The modal logic of provability. The sequential approach.Giovanni Sambin & Silvio Valentini - 1982 - Journal of Philosophical Logic 11 (3):311 - 342.
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  • On the proof theory of the modal logic for arithmetic provability.Daniel Leivant - 1981 - Journal of Symbolic Logic 46 (3):531-538.
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