1. E. Urbanovici and E. Segal, ICTAC News, 27 (1994) 13.
2. I. Barin, O. Knacke and O. Kubaschewski, Thermochemical Properties of Inorganic Substances (Supplement), Springer Vrlg., Berlin 1977, pp. LIII-LXXX.
3. D. I. Anderson, Theory of the Earth, Oxford, Blackwell Scientific Publications, 1989, quoted in [5].
4. G. W. Gibbs, Am. Miner., 67 (1982) 421.
5. A. Nawrotski, Physics and Chemistry of Earth Materials, Cambridge University Press 1994, p. 149.