1. R. Stratton, in ?Progress in Dielectrics?, Vol. III, edited by J. B. Birks and J. Hart (Wiley, New York, 1961) p. 281.
2. P. D. Greene, E. L. Bush and I. R. Rawlings, Extended Abstract no. 479, The Electrochemical Society Meeting, Fall 1968, Montreal, Canada (available from The Electrochemical Society, Princeton, N.J., USA).
3. A. K. Vijh, ?Electrochemistry of Metals and Semiconductors? (Marcel Dekker, New York, 1973) p. 232.
4. Idem, J. Mater. Sci. 5 (1970) 379.
5. J. D. Axe, in ?Solid State Chemistry and Physics?, Vol. I, edited by P. F. Weller (Marcel Dekker, New York, 1973) p. 498, Fig. 26.