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@article{AL_1976_15_2_a3, author = {V. V. Rybakov}, title = {Hereditarily finitely axiomatizable extensions of the logic {S4}}, journal = {Algebra i logika}, pages = {185--204}, publisher = {mathdoc}, volume = {15}, number = {2}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1976_15_2_a3/} }
V. V. Rybakov. Hereditarily finitely axiomatizable extensions of the logic S4. Algebra i logika, Tome 15 (1976) no. 2, pp. 185-204. http://geodesic.mathdoc.fr/item/AL_1976_15_2_a3/