%0 Journal Article
%A M. A. Gol'dman
%A S. N. Krachkovskii
%T Products, powers and contractions of homomorphisms
%J Doklady Akademii Nauk
%D 1968
%P 1038-1041
%V 181
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1968_181_5_a2/
%G ru
%F DAN_1968_181_5_a2