1. L. Pauling, ‘The nature of the chemical bond’,2nd ed., CornellUniv. Press, 1948, p. 69.
2. Ibid., p. 421.
3. C.S. Smith, Trans AIME, 1948, 15, 175.
4. M. Humenik and W.D. Kingery, J. Amer. Ceram, Soc., 1954, 37, 18.
5. Yu Naidich, Progress in Surface and Membrane Science, 1981, 14,353. J