@article{PFMT_2019_4_a9,
     author = {M. N. Konovalova and I. L. Sokhor},
     title = {Finite groups with formational subnormal subgroups},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {51--54},
     publisher = {mathdoc},
     number = {4},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2019_4_a9/}
}