1. Wagner, C., Nachr. Akad. Wiss. Gottingen, II. Math.-Physik., Kl., 1973, p. 37.
2. Gibbs, J. W., Collected Works, Yale University Press, New Haven (1948), Vol. I, pp. 219ff.
3. Guggenheim, E. A., Trans. Faraday Soc., 36, 397 (1940).
4. Moelwyn-Hughes, E. A., Physical Chemistry, Pergamon Press, Oxford (1957), pp. 912ff.
5. Defay, R., Prigogine, I., Bellemans, A., and Everett, D. H., Surface Tension and Adsorption, Longmans, London (1966), pp. 22ff.