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@article{AL_1984_23_5_a5, author = {V. V. Rybakov}, title = {A criterion for admissibility of rules in the modal system}, journal = {Algebra i logika}, pages = {546--572}, publisher = {mathdoc}, volume = {23}, number = {5}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1984_23_5_a5/} }
V. V. Rybakov. A criterion for admissibility of rules in the modal system. Algebra i logika, Tome 23 (1984) no. 5, pp. 546-572. http://geodesic.mathdoc.fr/item/AL_1984_23_5_a5/