%0 Journal Article
%A Z. D. Usmanov
%T On~infinitesimal deformations of surfaces of positive curvature with an isolated flat point
%J Sbornik. Mathematics
%D 1970
%P 595-614
%V 12
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1970_12_4_a7/
%G en
%F SM_1970_12_4_a7