@article{DAN_1964_156_6_a0,
     author = {Ya. G. Berkovich},
     title = {The existence of subgroups of a finite non-solvable group},
     journal = {Doklady Akademii Nauk},
     pages = {1255--1257},
     publisher = {mathdoc},
     volume = {156},
     number = {6},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_156_6_a0/}
}