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@article{AL_1985_24_1_a5, author = {V. V. Rybakov}, title = {Bases of admissible rules of the logics ${\rm S}4$ and}, journal = {Algebra i logika}, pages = {87--107}, publisher = {mathdoc}, volume = {24}, number = {1}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1985_24_1_a5/} }
V. V. Rybakov. Bases of admissible rules of the logics ${\rm S}4$ and. Algebra i logika, Tome 24 (1985) no. 1, pp. 87-107. http://geodesic.mathdoc.fr/item/AL_1985_24_1_a5/