@article{IVM_2020_12_a4,
     author = {E. A. Tumanova},
     title = {On the root-class residuality of certain {HNN-extensions} of groups},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {41--50},
     publisher = {mathdoc},
     number = {12},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2020_12_a4/}
}