@article{PFMT_2021_4_a15,
     author = {M. N. Konovalova and V. S. Monakhov and I. L. Sokhor},
     title = {On strictly $2$-maximal subgroups of finite groups},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {95--100},
     publisher = {mathdoc},
     number = {4},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2021_4_a15/}
}