%0 Journal Article
%A È. R. Rozendorn
%T The exactness of theorems on the smoothness of a surface with negative curvature of given smoothness
%J Vestnik Moskovskogo universiteta. Matematika, mehanika
%D 1994
%P 99-101
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/VMUMM_1994_2_a13/
%G ru
%F VMUMM_1994_2_a13