%0 Journal Article
%A V. K. Ionin
%T Isoperimetric inequalities in simply connected Riemann spaces of nonpositive curvature
%J Doklady Akademii Nauk
%D 1972
%P 282-284
%V 203
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1972_203_2_a5/
%G ru
%F DAN_1972_203_2_a5