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@article{IM2_1969_3_1_a2, author = {V. A. Yankov}, title = {Conjunctively indecomposable formulas in propositional calculi}, journal = {Izvestiya. Mathematics }, pages = {17--35}, publisher = {mathdoc}, volume = {3}, number = {1}, year = {1969}, language = {en}, url = {http://geodesic.mathdoc.fr/item/IM2_1969_3_1_a2/} }
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/