%0 Journal Article
%A U. Abresch
%T Isoparametric Hypersurfaces with Four or Six Distinct Principal Curvatures.  Necessary Conditions on the Multiplicities.
%J Mathematische Annalen
%D 1983
%P 283-302
%V 264
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1983__264_163788/
%F MAN_1983__264_163788