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@article{AL_1974_13_2_a5, author = {L. L. Maksimova and V. V. Rybakov}, title = {The lattice of normal modal logics}, journal = {Algebra i logika}, pages = {188--216}, publisher = {mathdoc}, volume = {13}, number = {2}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1974_13_2_a5/} }
L. L. Maksimova; V. V. Rybakov. The lattice of normal modal logics. Algebra i logika, Tome 13 (1974) no. 2, pp. 188-216. http://geodesic.mathdoc.fr/item/AL_1974_13_2_a5/