New results toward the classification of Biharmonic submanifolds in   $\mathbb{S}^{n}$
  We prove some new rigidity results for proper biharmonic immersions in ${\mathbb S}^n$ of the following types: Dupin hypersurfaces; hypersurfaces, both compact and non-compact, with bounded norm of the second fundamental form; hypersurfaces satisfying intrinsic properties; PMC submanifolds; parallel submanifolds. 
A. Balmus and S. Montaldo and C. Oniciuc
math.DG