@article{PFMT_2020_2_a7,
     author = {R. V. Borodich and R. A. Kucherov},
     title = {On maximal abnormal subgroups close to $\mathfrak{F}$-abnormal},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {46--51},
     publisher = {mathdoc},
     number = {2},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2020_2_a7/}
}