%0 Journal Article
%A L. N. Vaserstein
%T The congruence problem for a unitary group of rank $\ge2$
%J Sbornik. Mathematics
%D 1968
%P 351-355
%V 5
%N 3
%U http://geodesic.mathdoc.fr/item/SM_1968_5_3_a2/
%G en
%F SM_1968_5_3_a2