1. D.E. BLAIR, Contact manifolds in Riemannian geometry, Lecture Notes in Mathematics 509, Springer Verlag, Berlin, 1976.
2. F. DILLEN, B. OPOZDA, L. VERSTRAELEN and L. VRANCKEN, On totally real sub-manifolds of the nearly Kaehler 6-sphere, Proc. Amer. Math. Soc., 99 (1987), 741?749.
3. A. ROS, A characterization of seven compact Kaehler submanifolds by holomorphic pinching, Ann. of Math., 121 (1985), 377?382,
4. K. YANO and M. KON, CR submanifolds of Kaehlerian and Sasakian manifolds, Progress in Math. 30, Birkhäuser, 1983.
5. Series in Pure Mathematics, Volume 3;K. Yano,1984