%0 Journal Article
%A K. B. Sabitov
%T Maximum modulus principles for some classes of second-order
%J Doklady Akademii Nauk
%D 1989
%P 1321-1324
%V 309
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1989_309_6_a9/
%G ru
%F DAN_1989_309_6_a9