Geodesic
On a~new constant in intuitionistic propositional logic
Fundamentalʹnaâ i prikladnaâ matematika, Tome 5 (1999) no. 3, pp. 903-926.

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The classification theorem for the family of all Novikov complete extensions of the intuitionistic propositional logic in the language containing a single additional constant is proved. The algorithmic problem of the conservativeness of calculi in this enriched language over intuitionistic propositional logic is established to be decidable. 
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     title = {On a~new constant in intuitionistic propositional logic},
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     url = {http://geodesic.mathdoc.fr/item/FPM_1999_5_3_a18/}
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A. D. Yashin. On a~new constant in intuitionistic propositional logic. Fundamentalʹnaâ i prikladnaâ matematika, Tome 5 (1999) no. 3, pp. 903-926. http://geodesic.mathdoc.fr/item/FPM_1999_5_3_a18/