%0 Journal Article
%A Rolf Walter
%A Norbert Kleinjohann
%T Nonnegativity for the Curvature Operator and Isotropy for Isometric Immersions.
%J Mathematische Zeitschrift
%D 1982
%P 129-142
%V 181
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1982__181_173222/
%F MZ_1982__181_173222