%0 Journal Article %A Wolfgang Kühnel %A Markus Becker %T Hypersurfaces with constant inner curvature of the second fundamental form, and the non-rigidity of the sphere. %J Mathematische Zeitschrift %D 1996 %P 693-708 %V 223 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1996__223_3_174946/ %F MZ_1996__223_3_174946