Geodesic
On the extension of the intuitionist propositional calculus to the classical calculus, and the minimal calculus to the intuitionist calculus
Izvestiya. Mathematics , Tome 2 (1968) no. 1, pp. 205-208.

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We consider extensions of the intuitionist and minimal propositional calculi effected by the addition of a single formula as a new axiom. 
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V. A. Yankov. On the extension of the intuitionist propositional calculus to the classical calculus, and the minimal calculus to the intuitionist calculus. Izvestiya. Mathematics , Tome 2 (1968) no. 1, pp. 205-208. http://geodesic.mathdoc.fr/item/IM2_1968_2_1_a8/

[1] Yankov V. A., “O nekotorykh superkonstruktivnykh ischisleniyakh vyskazyvanii”, Dokl. AN SSSR, 151:4 (1963), 796–798 | Zbl

[2] Troelstra A. S., “On intermediate propositional logics”, Nederl. Akad. Wet., Proc. (A), 68:1 (1965), 141–152 | MR | Zbl