1. Bernai, J. D. Observatory 59, 268 (1936).
2. Ringwood, A. E. Composition and Petrology of the Earth's Mantle (McGraw-Hill, New York, 1975).
3. Liu, L. in The Earth: Its Origin, Structure and Evolution (ed. McElhinny, M. W.) 177–202 (Academic, New York, 1979).
4. Jeanloz, R. & Thompson, A. B., Rev. Geophys. Space Phys. 21, 51–74 (1983).
5. Navrotsky, A. & Akaogi, M. J. geophys. Res. 89, 10135–10140 (1984).