%0 Journal Article
%A A. I. Achil'diev
%A Z. D. Usmanov
%T Rigidity of a surface with a point of flattening
%J Sbornik. Mathematics
%D 1967
%P 77-83
%V 2
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1967_2_1_a5/
%G en
%F SM_1967_2_1_a5