@article{PFMT_2020_4_a18,
     author = {I. N. Safonova},
     title = {On minimal $\sigma$-local non-$\mathfrak{H}$-formations of finite groups},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {105--112},
     publisher = {mathdoc},
     number = {4},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2020_4_a18/}
}