1. F. K. McTaggart andJ. Bear,J. Appl. Chem. 5 (1955) 643.
2. W. Hughes, 10th Fatipec Congress Book (Verlag Chemie Gmbh, Weinheim, Germany, 1970) p. 67.
3. T. J. Wiseman in “Characterization of Powder Surfaces,“ edited by G. D. Parfitt and K. S. W. Sing (Academic Press, London, 1976), p. 163.
4. R. M. Cornell, A. M. Posner andJ. P. Quirk,J. Colloid Interface Sci. 53 (1975) 6.
5. T. Kubo andM. Kato,J. Chem. Soc. (Japan) 66 (1963) 403.