%0 Journal Article
%A A. V. Bitsadze
%T On elliptical systems of second order partial differential equations
%J Doklady Akademii Nauk
%D 1957
%P 983-986
%V 112
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1957_112_6_a0/
%G ru
%F DAN_1957_112_6_a0