1. B. Y. Chen, Geometry of Submanifolds, Marcel Dekker, New York, 1973.
2. B. Y. Chen, Pseudo-umbilical submanifolds of a Riemannian manifold of constant curvature II, J. Math. Soc. Japan,25(1) (1973), 105?114.
3. B. Y. Chen, On submanifolds of finite type, Soochow J. Math.,9 (1983), 17?23.
4. B. Y. Chen, Total mean curvature and submanifolds of finite type, World Scientific, (1984).
5. B. Y. Chen, 2-type submanifolds and their applications, Chinese J. Math.,14 (1986), 1?14.