@article{PFMT_2016_4_a6,
     author = {R. V. Borodich and E. N. Borodich and M. V. Selkin},
     title = {On the structure of subnormal subgroups in groups with operators},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {41--44},
     year = {2016},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2016_4_a6/}
}