1. Anderson, D.L., Ben-Menahen, A. and Archambeau, C.R. (1965) Attenuation of seismic energy in the upper mantle, J. Geophys. Res. 70, 1441–1448.
2. Dziewonski, A.M. and Anderson, D.L. (1981) Preliminary Reference Earth Model (PREM), Phys. Earth. Planet. Inter. 25, 297–3 56.
3. Widmer, R., Masters, G., and Gilbert, F. (1991) Spherically symmetric attenuation within the Earth from normal mode data, Geophys. J. Int. 104, 541–553.
4. Anderson, D.L. and Archambeau, C.R. (1964) The anelasticity of the Earth, J. Geophysics. Res. 69, 2071–2084.
5. Deschamps, A. (1977) Inversion of the attenuation data of free oscillations of the Earth (fundamental and first higher modes), Geophys. J. 50, 699–722.