1. For a general treatment of electrokinetic phenomena, see for example: H.R. Kruyt, Colloid Science, Elsevier, Amsterdam, 1962 p. 194
2. D.G. Miller, Chem. Rev. 60, 15 (1960)
3. J.A.V. Butler, Electrocapillarity, Methuen, London, 1940 p. 92
4. J.D. Shaw, Electrophoresis, Academic Press, New York, 1969
5. F. Bootle, Nature 161, 83 (1948).