@article{SM_2007_198_6_a0,
     author = {A. Ballester-Bolinches and C. Calvo and L. A. Shemetkov},
     title = {On partially saturated formations of finite groups},
     journal = {Sbornik. Mathematics},
     pages = {757--775},
     year = {2007},
     volume = {198},
     number = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2007_198_6_a0/}
}