%0 Journal Article %A È. R. Rozendorn %T The influence of the intrinsic metric on the regularity of a surface of negative curvature %J Sbornik. Mathematics %D 1967 %P 207-223 %V 2 %N 2 %U http://geodesic.mathdoc.fr/item/SM_1967_2_2_a4/ %G en %F SM_1967_2_2_a4