@article{ZNSL_1991_198_a8,
     author = {A. V. Stepanov},
     title = {On arrangment of subgroups, normalized by a subgroup},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {92--102},
     year = {1991},
     volume = {198},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1991_198_a8/}
}