Schwarzian derivatives of contact diffeomorphisms.
Second order parallel tensors on generalized Sasakian space forms and semi parallel hypersurfaces in Sasakian space forms.
Special directions in complex contact manifolds.
Special spinors and contact geometry.
Submanifolds of -structure manifold satisfying .
Submanifolds with harmonic mean curvature in pseudo-Hermitian geometry
We classify Hopf cylinders with proper mean curvature vector field in Sasakian 3-manifolds with respect to the Tanaka-Webster connection.