%0 Journal Article
%A Jens Heber
%T On the geometric rank of homogeneous spaces of nonpositive curvature.
%J Inventiones mathematicae
%D 1993
%P 151-170
%V 112
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1993__112_3_144098/
%F IM_1993__112_3_144098