%0 Journal Article
%A A. I. Vol'pert
%T Investigation of boundary problems for elliptical systems of differential equations on a plane
%J Doklady Akademii Nauk
%D 1957
%P 462-464
%V 114
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1957_114_3_a2/
%G ru
%F DAN_1957_114_3_a2