@article{FPM_1997_3_3_a2,
     author = {G. N. Arzhantseva},
     title = {On the groups in which the subgroups with fixed number of generators are free},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {675--683},
     publisher = {mathdoc},
     volume = {3},
     number = {3},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_1997_3_3_a2/}
}