%0 Journal Article
%A A. I. Vol'pert
%T On the index and normal solvability of boundary value problems for elliptic systems of differential equations in the plane
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1960
%V 15
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1960_15_3_a15/
%G ru
%F RM_1960_15_3_a15