References
- Lecture notes in Math. Contact manifolds in Riemannian geometry D.E.Blair
- Publ. Study Grorp of Differential Geometry Differential geometry of fibred space S.Ishihara;M.Konishi
- Tohoku Math. J. v.24 A class of almost contact Riemannian manifold K.Kenmotsu
- Hiroshima Math. J. v.20 Fibred Riemannian space with quasi Sasakian structure B.H.Kim
- Hiroshima Math. J. v.18 Almost complex and almost contact structures in fibred Riemannian space Y.Tashiro;B.H.Kim