Geodesic
Conjunctively indecomposable formulas in propositional calculi
Izvestiya. Mathematics , Tome 3 (1969) no. 1, pp. 17-35.

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Formulas in intuitionistic propositional calculus and its subsystems are studied that cannot be decomposed into a proper conjunction. 
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V. A. Yankov. Conjunctively indecomposable formulas in propositional calculi. Izvestiya. Mathematics , Tome 3 (1969) no. 1, pp. 17-35. http://geodesic.mathdoc.fr/item/IM2_1969_3_1_a2/

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[3] Yankov V., “O svyazi mezhdu vyvodimostyu v intuitsionistskom ischislenii vyskazyvanii i konechnymi implikativnymi strukturami”, Dokl. AN SSSR, 151:6 (1963), 1293–1294 | Zbl

[4] Klini S. K., Vvedenie v metamatematiku, IL, M., 1957

[5] Curry H., Lecons de logique algébrigue, Paris, 1952