%0 Journal Article
%A È. M. Saak
%T On the theory of multidimensional elliptic systems of first order
%J Doklady Akademii Nauk
%D 1975
%P 43-46
%V 222
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1975_222_1_a9/
%G ru
%F DAN_1975_222_1_a9