1. Maiti, M. , 1975, “Stress in Anisotropic Nonhomogeneous Sphere,” J. Eng. Mech., 101, pp. 101–108.
2. Montagner, J. P., and Anderson, D. L., 1989, “Constrained Reference Mantle Model,” Phys. Earth Planet. Inter., 54, pp. 205–227.
3. Chen, W. Q., 1996, Coupled Free Vibrations of Spherically Isotropic Hollow Spheres, Ph.D. dissertation, Zhejiang University, Hangzhou, China (in Chinese).
4. Hu, H. C. , 1954, “On the General Theory of Elasticity for a Spherically Isotropic Medium,” Acta Sci. Sin., 3, pp. 247–260.
5. Chen, W. T. , 1966, “On Some Problems in Spherically Isotropic Elastic Materials,” ASME J. Appl. Mech., 33, pp. 539–546.