@article{AL_1985_24_1_a5,
     author = {V. V. Rybakov},
     title = {Bases of admissible rules of the logics ${\rm S}4$ and},
     journal = {Algebra i logika},
     pages = {87--107},
     publisher = {mathdoc},
     volume = {24},
     number = {1},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1985_24_1_a5/}
}