%0 Journal Article
%A N. N. Tarkhanov
%T Approximation in Sobolev spaces by solutions of elliptic systems
%J Doklady Akademii Nauk
%D 1990
%P 1308-1313
%V 315
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1990_315_6_a5/
%G ru
%F DAN_1990_315_6_a5