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4. E. L. Ivchenko, Optical Spectroscopy of Semiconductor Nanostructures (Alpha Science, Harrow, United Kingdom, 2005).
5. G. Abstreiter, M. Cardona, and A. Pinczuk, in Light Scattering in Solids, Ed. by M. Cardona (Springer-Verlag, Heidelberg, 1975; Mir, Moscow, 1979), Issue IV, p. 12.