%0 Journal Article
%A K. B. Sabitov
%T The maximum principle for systems of second-order equations of
%J Doklady Akademii Nauk
%D 1989
%P 783-786
%V 305
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1989_305_4_a2/
%G ru
%F DAN_1989_305_4_a2