@article{PFMT_2014_2_a5,
     author = {T. I. Vasil'eva and A. I. Prokopenko},
     title = {On the construction of $\pi${-Schunk} classes of finite $\pi$-soluble groups},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {38--41},
     publisher = {mathdoc},
     number = {2},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2014_2_a5/}
}