1. Ash, S. G., D. H. Everett, C. J. Radke, J. C. S. Faraday II, 69, 1256 (1973); D. H. Everett, C. J. Radke, A. C. S. Symposium Series no. 8, chapter 1, p. 1, (1975); D. H. Everett, Israel J. Chem., 14, 267 (1975); D. G. Hall, J. C. S. Faraday II, 68 (1972).
2. IUPAC, Manual of Symbols and Terminology for Physico-chemical Quantities and Units, Appendix II, Part I, Definitions, Terminology and Symbols in Colloid and Surface Chemistry; Pure and Applied Chemistry, 31, 579 (1972).
3. Everett, D. H. in Specialist Periodical Reports: Colloid Science (Chemical Society, London) Vol. 1, chapter 2 (1973).
4. IUPAC, Manual of Symbols and Terminology for Physico-chemical Quantities and Units, Appendix II, Part II, Heterogeneous Catalysis; Pure and Applied Chemistry, 46, 73 (1976).
5. Ref. 3, p. 65; A. L. Myers and S. Sircar, J. Phys. Chem., 76, 3412 (1972).