@article{AL_1975_14_3_a4,
     author = {L. L. Maksimova},
     title = {Modal logics of finite layers},
     journal = {Algebra i logika},
     pages = {304--319},
     publisher = {mathdoc},
     volume = {14},
     number = {3},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1975_14_3_a4/}
}