1. L. Pearce Williams, Michael Faraday: A Biography, Chapman and Hall, London (1965).
2. B. E. Conway, Electrochemical Data, Elsevier, Amsterdam (1952).
3. N. F. Mott and B. Cabrera, Rept. Prog. Physics, 12, 163 (1949).
4. P. Debye, Phys. Zeit., 13, 97 (1912)
5. see also P. Langevin, J. Phys., 4 (4), 678 (1905).