1. V. M. Agranovich, and V. L. Ginzburg, Spatial Dispersion in Crystal Optics and the Theory of Excitons (Interscience Publ., London, 1966).
2. W. Hanke, Adv. Phys. 27, 287 (1978) and references therein.
3. F. Wooten, Optical Properties of Solids (Academic Press, London,1972).
4. J. D. Jackson, Classical Electrodynamics (Wiley, New York, 1975).
5. F. Stern, Solid State Physics, vol. 15, F. Seitz, D. Turnbull, eds, p. 300 (1963).