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@article{AL_1977_16_4_a8, author = {V. V. Rybakov}, title = {Noncompact extensions of the logic ${\rm S}4$}, journal = {Algebra i logika}, pages = {472--490}, publisher = {mathdoc}, volume = {16}, number = {4}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1977_16_4_a8/} }
V. V. Rybakov. Noncompact extensions of the logic ${\rm S}4$. Algebra i logika, Tome 16 (1977) no. 4, pp. 472-490. http://geodesic.mathdoc.fr/item/AL_1977_16_4_a8/