1. On the vibrations of an elastic sphere;Lamb;Proc. Lond. Math. Soc.,1881
2. Dispersion of elastic waves propagated on the surface of stratified bodies and on curved surfaces;Sezawa;Bull. Earthq. Res. Inst. Tokyo,1927
3. Basic study on the oscillation of a homogeneous elastic sphere I. Frequency of the free oscillation;Sato;Geophys. Mag,1962
4. Quantitative Seismology, Theory and Methods, vol. 1;Aki,1980
5. Three-dimensional and shell-theory analysis of elastic waves in a hollow sphere: Part 1—Analytical foundation;Shah;J. Appl. Mech.,1969