%0 Journal Article
%A Ya. G. Berkovich
%T A~generalization of the theorems of Hall and Blackburn and their applications to nonregular $p$-groups
%J Izvestiya. Mathematics 
%D 1971
%P 815-844
%V 5
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_1971_5_4_a5/
%G en
%F IM2_1971_5_4_a5