1. V. B. Berestetskii, E. M. Lifshits, and L. P. Pitaevskii, Relativistic Quantum Theory (Nauka, Moccow, 1968), part 1.
2. L. D. Landau and E. M. Lifshits, Quantum Mechanics (Nauka, Moscow, 1974) [in Russian].
3. Yu. M. Kagan and Yu. V. Kononets, Quantum Channeling Rheory (Mosk. Inzh.-Fiz. Inst., Moscow, 1979) [in Russian].
4. P. M. Platzman and P. A. Wolff, Waves and Interactions in Solid State Plasmas (Academic, New York, 1973; Mir, Moscow, 1975).
5. Light Scattering in Solids 1, Ed. by M. Cardona, Topics in Applied Physics, Vol. 8 (Springer, Berlin, 1975; Mir, Moscow, 1979).