1. Y. Shiraki, ?Fabrication Process of Ceramics?, Vol. I (Gihodo, Tokyo, 1978) p. 117.
2. E. J. V. Verwey andJ. Th. G. Overbeek, ?Theory of the Stability of Lyophobic Colloids? (Elsevier, Amsterdam, 1948).
3. J. Th. G. Overbeek, ?The Investigation Between Colloid Particles?, in ?Colloid Science?, edited by H. R. Kruyt (Elsevier, Amsterdam, 1952) p. 245.
4. A. Kitahara andA. Watanabe, ?Electric Phenomena at Interfaces? (Kyoritsu Shuppan, Tokyo, 1972) p. 50.
5. T. F. Tadros (ed.), ?Solid/Liquid Dispersions? (Academic Press, London, 1987) p. 149.