%0 Journal Article
%A N. S. Romanovskii
%T A~freedom theorem for groups with one defining relation in the varieties of solvable and nilpotent groups of given lengths
%J Sbornik. Mathematics
%D 1972
%P 93-99
%V 18
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1972_18_1_a5/
%G en
%F SM_1972_18_1_a5