1. Manifolds, Tensor Analysis and Applications;Abraham,1988
2. Harmonic Morphisms Between Riemannian Manifolds;Baird,2003
3. Geometry of CR-Submanifolds;Bejancu,1986
4. Vacuum configurations for superstrings;Candelas;Nuclear Phys. B,1985
5. On totally real submanifolds;Chen;Trans. Amer. Math. Soc.,1974