Tangentially biharmonic Lagrangian H-umbilical submanifolds in complex   space forms
  The notion of Lagrangian $H$-umbilical submanifolds was introduced by B. Y. Chen in 1997, and these submanifolds have appeared in several important problems in the study of Lagrangian submanifolds from the Riemannian geometric point of view. Recently, the author introduced the notion of tangentially biharmonic submanifolds, which are defined as submanifolds such that the bitension field of the inclusion map has vanishing tangential component. The normal bundle of a round hypersphere in $\mathbb{R}^n$ can be immersed as a tangentially biharmonic Lagrangian $H$-umbilical submanifold in $\mathbb{C}^n$. Motivated by this fact, we classify tangentially biharmonic Lagrangian $H$-umbilical submanifolds in complex space forms. 
Toru Sasahara
math.DG