%0 Journal Article
%A D. V. Tunitsky
%T Regular isometric immersion in the large of two-dimensional metrics of nonpositive curvature
%J Sbornik. Mathematics
%D 1993
%P 317-329
%V 76
%N 2
%U http://geodesic.mathdoc.fr/item/SM_1993_76_2_a4/
%G en
%F SM_1993_76_2_a4