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2. H. J. Welker, ibid.9 (1979) 1.
3. H. K. Henisch, in ?Rectifying semiconductor contacts? (Oxford University Press, London, 1957) p. 372.
4. S. J. Fonash, in ?Solar cell device physics? (Academic Press, New York, 1981) p. 86.
5. K. G. Kao andW. Hwang, ?Electrical transport in solids?, Vol. 14 (Pergamon Press, Oxford, 1981).