%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 on the plane
%J Trudy Moskovskogo matematičeskogo obŝestva
%D 1961
%P 41-87
%V 10
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MMO_1961_10_a1/
%G ru
%F MMO_1961_10_a1