1. Adams, R.D., 1968, Early reflections of P’P’ as an indication of upper mantle structure, Bull. Seismo. Soc. Am., 58, p. 1933.
2. Akaogi, M., Ito, E. and Navrotsky, A., 1989, Olivine-modified spinel transitions in the system Mg2SiO4-Fe2SiO4, J. Geophys. Res, 94, pp. 15,671–15,685.
3. Akaogi, M., Navrotsky, A., Yagi, T., Akimoto, S., 1987, Pryoxene-gamet transformations, in Manghnani, M. H., Syono, Y.(eds), High-pressure research in mineral physics, Terra Pub, Tokyo, pp. 251–260.
4. Akimoto, S., and Fujisawa, H., 1968, Olivine-spinel solid solution equilibrium in the system Mg2SiO4-Fe2SiO4, J. Geophys. Res, 73, pp. 1467–1479.
5. Anderson, Don L., 1967a, Latest information from seismic observations: Ch. 12, in The Earth’s Mantle, Academic Press Inc., London, pp. 355–420.