%0 Journal Article
%A È. R. Rozendorn
%T Some sufficient conditions for regularity of a surface with constant negative intrinsic curvature
%J Doklady Akademii Nauk
%D 1972
%P 296-299
%V 207
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1972_207_2_a11/
%G ru
%F DAN_1972_207_2_a11