@article{VMUMM_2008_1_a4,
     author = {O. A. Shpyrko},
     title = {The nilpotent $\pi$-length of finite $\pi$-solvable groups with restrictions on subgroups},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {21--25},
     publisher = {mathdoc},
     number = {1},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2008_1_a4/}
}