References
- Ann. Sci. Ecole Norm. Sup. v.3 Quelques formules de variation pour une structure riemanniane M. Begger
- Geometry of submanifold B. Y. Chen
- Tensor N. S. v.7 On conharmonic transformation Y. Ishi
- Proc. Japan Academy v.71 no.Ser A Wraped products with critical Riemannian metric B. H. Kim
- J. Math. Soc. Japan v.29 Riemannian submersion and critical Riemonnian metrics Y. Muto
- Exercises on riemannian geometry S. Tachibana