@article{PFMT_2020_1_a10,
     author = {S. V. Balychev and A. S. Vegera},
     title = {Soluble saturated formations with the $\mathcal{P}_2$ property for finite groups},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {74--80},
     publisher = {mathdoc},
     number = {1},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2020_1_a10/}
}