1. Blaschke, W.: Vorlesungen über Differentialgeometrie, Vol. 3, Springer-Verlag, Berlin, 1929
2. Lecture Notes in Math;T E Cecil,1989
3. Hu, Z. J., Li, H.: Classification of Möbius isoparametric hypersurfaces in S 4. Nagoya Math., 179, 147–162 (2005)
4. Hu, Z. J., Li, H.: The classification of hypersurfaces in S n+1 with parallel Möbius second fundamental form. Sci. China, Ser. A, 34(1), 28–39 (2004)
5. Li, H.: Generalized Cartan identities on isoparametric manifolds. Ann. Global Anal. Geom., 15, 45–50 (1997)