%0 Journal Article %A A. N. Skiba %A L. A. Shemetkov %T Multiply $\omega$-Local Formations and Fitting Classes of Finite Groups %J Matematičeskie trudy %D 1999 %P 114-147 %V 2 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MT_1999_2_2_a6/ %G ru %F MT_1999_2_2_a6