%0 Journal Article
%A I. S. Brandt
%T Some properties of surfaces with slowly varying negative extrinsic curvature in a~Riemannian space
%J Sbornik. Mathematics
%D 1970
%P 313-324
%V 12
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1970_12_2_a9/
%G en
%F SM_1970_12_2_a9