@article{ADM_2009_4_a3,
     author = {A. Ballester-Bolinches and Luis M. Ezquerro and Alexander N. Skiba},
     title = {On subgroups which cover or avoid chief factors of a~finite group},
     journal = {Algebra and discrete mathematics},
     pages = {18--28},
     publisher = {mathdoc},
     number = {4},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2009_4_a3/}
}