1. M. Born and E. Wolf, Principles of Optics (Cambridge Univ. Press, Cambridge, 1999).
2. G. S. Landsberg, Optics (Fizmatlit, Moscow, 2003) [in Russian].
3. R. Feynman, R. Leighton, and M. Sands, The Feynman Lectures on Physics (Basic Books, 2011), Vol. 7.
4. M. F. Vuks, Electric and Optical Properties of Molecules and Condensed Media (Leningr. Gos. Univ., Leningrad, 1984) [in Russian].
5. N. M. Balzaretti, Solid State Commun. 99, 943 (1996).