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Reference7 articles.
1. D.E. BLAIR, ?Contact manifolds in Riemannian geometry?, Lectures Notes in Math., Vol.509, Springer-Verlag, New York, 1975.
2. D.E. BLAIR, ?The theory of quasi-Sasakian structures?, J. Diff. Geeometry,1.(1967), 331?345.
3. B.Y. CHEN, ?Geometry of submanifolds?, Marcel Dekker, Inc., New York, 1973.
4. B.Y. CHEN, ?Extrinsic spheres in Kaehler manifolds, I?II?, Michigan Math. J.,23(1976), 327?330,24(1977), 97?102.
5. M. OBATA, ?Certain conditions for a Riemannian manifold to be isometric with a sphere?, J.Math.Soc. Japan,14(1962), 333?340.