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A. V. Kuznetsov. On intuitionistic propositional provability calculus. Doklady Akademii Nauk SSSR, 283, 27-30, 1985. (Russian); English translation: Soviet Math. Doklady, 32, 27-30, 1985.
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V. Y. Shavrukov. On two extensions of the provability logic GL. Russian Academy of sciences. Sbornik. Mathematics, 181, 240-255, 1990. (Russian); English translation: Mathematics of the USSR Sbornik, 69, 255-270, 1991..
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V. A. Yankov. The relationship between deducibility in the intuitionistic propositional calculus and finite implicational structures. Doklady Akademii Nauk SSSR, 151, 1293-1294, 1963. (Russian); English translation: Soviet Mathematics Doklady, 4, 1203-1203, 1963.
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A. D. Yashin. On number of new logical constants in the intuitionistic prepositional calculus. Moscow Univ. Vestnik, Math. Mech. Series, 1, 7-10, 1997. (Russian); English translation: to appear.
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