@article{PFMT_2020_4_a16,
     author = {N. S. Kosenok and V. M. Selkin},
     title = {On the $\sigma_i$-length of a finite $\sigma$-soluble group},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {95--97},
     publisher = {mathdoc},
     number = {4},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2020_4_a16/}
}