Biharmonic curves in Lorentzian para-Sasakian manifolds.
Biharmonic curves in the generalized Heisenberg group.
Biharmonic maps between doubly warped product manifolds.
Biharmonic Riemannian maps
We give necessary and sufficient conditions for Riemannian maps to be biharmonic. We also define pseudo-umbilical Riemannian maps as a generalization of pseudo-umbilical submanifolds and show that such Riemannian maps put some restrictions on the target manifolds.
Biharmonic submanifolds in 3-dimensional -manifolds.
Biwave maps into manifolds.