%0 Journal Article
%A A. L. Verner
%T The structure of certain complete surfaces of non-positive curvature
%J Doklady Akademii Nauk
%D 1968
%P 269-272
%V 180
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1968_180_2_a2/
%G ru
%F DAN_1968_180_2_a2