%0 Journal Article
%A Bangert, V.
%A Schroeder, V.
%T Existence of flat tori in analytic manifolds of nonpositive curvature
%J Annales scientifiques de l'École Normale Supérieure
%D 1991
%P 605-634
%V 24
%N 5
%I Elsevier
%U http://www.numdam.org/articles/10.24033/asens.1638/
%R 10.24033/asens.1638
%G en
%F ASENS_1991_4_24_5_605_0