1. Henisch, H. K., Rectifying Semiconductor Contacts (Clarendon, Oxford, 1957).
2. Schottky, W., and Spenke, E., Wiss, Veroff. a.d. Siemens-Werken, 18, 225 (1939).
3. Mott, N. F., Proc. R. Soc., A 171, 27 and 144 (1939).
4. Gossick, B. R., Surface Sci., 21, 123 (1970).
5. Gossick, B. R., Surface Sci., 25, 465 (1971).