@article{MZM_2017_102_4_a11,
     author = {E. V. Sokolov and E. A. Tumanova},
     title = {Root {Class} {Residuality} of {HNN-Extensions} with {Central} {Cyclic} {Associated} {Subgroups}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {597--612},
     publisher = {mathdoc},
     volume = {102},
     number = {4},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2017_102_4_a11/}
}