1. G. W. Gibbs, Thermodynamics, Vol. 1 of The Collected Works (Yale Univ. Press, New Haven, CT, 1902).
2. E. A. Guggenheim, Thermodynamics. An Advanced Treatment for Chemists and Physicists (North-Holland, Amsterdam, 1949).
3. C. Herring, in The Physics of Power Metallurgy, Ed. by W. E. Kingston (McGraw-Hill, New York, 1951).
4. T. L. Hill, in Advanced in Catalysis and Related Subjects, Ed. by W. G. Frankenburg et al. (Academic, New York, 1952), Vol. 4, p. 211.
5. R. J. Tykodi, J. Chem. Phys. 22, 1647 (1954).