%0 Journal Article
%A V. B. Lidskii
%A P. A. Frolov
%T Connectivity components of normally solvable elliptic systems on the plane
%J Doklady Akademii Nauk
%D 1970
%P 728-731
%V 192
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1970_192_4_a5/
%G ru
%F DAN_1970_192_4_a5