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Translated from Sibirskii Matematicheskii, Vol. 37, No. 6, pp. 1413–1432, November–December, 1996.
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Yashin, A.D. A new regular constant in intuitionistic propositional logic. Sib Math J 37, 1242–1258 (1996). https://doi.org/10.1007/BF02106749
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DOI: https://doi.org/10.1007/BF02106749