%0 Journal Article
%A S. S. Ryshkov
%T On the problem of determining perfect quadratic forms of several variables
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1976
%P 215-239
%V 142
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TM_1976_142_a17/
%G ru
%F TM_1976_142_a17