5Itoh T. Addendum to my paper "On Veronese manifolds" [ J]. J. Math. Soe. Japan, 1978,30:73 - 74.
6Chern do Carmo S S, Kobayashi S. Minimal submanifolds of a sphere with second fundamental form of constant lenth [ M ]. Shiingshen Chem Selected Papers, Springer-Verlag, 1978. 395 - 409.
7doCarmo M P, Wallach N R. Minimal immersions of spheres into spheres [ J ]. Annals of Math. , 1971,95:43 -62.
8Wu C X.New characterizations of the Clifford tori and the Veronese surface[J] .Arch Math, 1993,61:277 -284.
9Chem S S, DoCanno M, Kobayashi S. Minimal submanifolds of a sphere with second fundamental form of constant length[M] .New York: Springer-Verlag, 1978.393 ~ 490.
10Li A M,Li J M.An intrinsic rigidity theorem for minimal submanifold in a sphere[J] .Arch Math,1992,58:582 ~ 594.
