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2. C.A. Brau, unpublished.
3. J.N. Hodgson, Optical Absorption and Dispersion in Solids, Chapman & Hall, London, 1970, pp. 62–65.
4. J.D. Jackson, Classical Electrodynamics, 3rd Edition, Wiley, New York, 1998, pp. 640–645.
5. E.D. Palik (Ed.), Handbook of Optical Constants of Solids, Academic Press, Boston, 1985.