References and Footnotes
- Jackson, John David (1999). Classical Electrodynamics (3rd ed. ed.). New York: Wiley. ISBN 0-471-30932-X.
- Griffiths, David J. (1998). Introduction to Electrodynamics (3rd ed.). Prentice Hall. ISBN 0-13-805326-X.
- J. I. Pankove, Optical Processes in Semiconductors, Dover Publications Inc. New York (1971).
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