@article{IVM_1997_11_a1,
     author = {A. F. Vasil'ev and T. I. Vasilyeva},
     title = {On finite groups whose principal factors are simple groups},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {10--14},
     publisher = {mathdoc},
     number = {11},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1997_11_a1/}
}