@article{PFMT_2019_4_a13,
     author = {V. N. Tyutyanov and A. A. Trofimuk},
     title = {Chains in finite groups},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {70--73},
     publisher = {mathdoc},
     number = {4},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2019_4_a13/}
}