@article{PFMT_2020_2_a9,
     author = {T. I. Vasilyeva and A. G. Koranchuk},
     title = {On one operation on the formations of finite groups},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {58--63},
     publisher = {mathdoc},
     number = {2},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2020_2_a9/}
}