@article{IVM_1978_8_a15,
     author = {A. A. Chebotar'},
     title = {Subgroups of groups with a~defining relation that are representable in the form of a~direct product},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {109--118},
     year = {1978},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1978_8_a15/}
}