%0 Journal Article
%A I. S. Ovchinnikov
%T The existence of mappings on the plane for degenerate first order elliptic systems
%J Doklady Akademii Nauk
%D 1970
%P 526-529
%V 191
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1970_191_3_a6/
%G ru
%F DAN_1970_191_3_a6