1. O. Kubaschewski and W. Slough, Progr. Mater. Sci. 14, 1 (1969).
2. K. Kiukkola and C. Wagner, J. Electrochem. Soc. 104, 308, 379 (1957).
3. B. C. H. Steele, in Electromotive Force Measurements in High Temperature Systems ed. C. B. Alcock, Institution of Mining and Metallurgy, London (1968), p. 1.
4. T. H. Etsell and S. N. Flengas, Chem. Rev. 70, 339 (1970).
5. H. Schmalzried, ed., Thermodynamics, Vol. I, IAEA, Vienna, (1966), p. 97.