%0 Journal Article
%A Yu. D. Burago
%A V. A. Toponogov
%T On three-dimensional Riemannian spaces with curvature bounded above
%J Matematičeskie zametki
%D 1973
%P 881-887
%V 13
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1973_13_6_a9/
%G ru
%F MZM_1973_13_6_a9