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@article{AL_1991_30_6_a2, author = {V. A. Lyubetskii}, title = {The transition from deducibility in classical set theory to}, journal = {Algebra i logika}, pages = {652--670}, publisher = {mathdoc}, volume = {30}, number = {6}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1991_30_6_a2/} }
V. A. Lyubetskii. The transition from deducibility in classical set theory to. Algebra i logika, Tome 30 (1991) no. 6, pp. 652-670. http://geodesic.mathdoc.fr/item/AL_1991_30_6_a2/