@article{FPM_2015_20_6_a8,
     author = {O. V. Kulikova},
     title = {On independent families of normal subgroups in free groups},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {189--206},
     publisher = {mathdoc},
     volume = {20},
     number = {6},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2015_20_6_a8/}
}