@article{PFMT_2014_4_a12,
     author = {A. N. Skiba},
     title = {On $\sigma$-properties of finite {groups~I}},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {89--96},
     publisher = {mathdoc},
     number = {4},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2014_4_a12/}
}