1. F. G. Bass, A. A. Bulgakov, and A. P. Tetervov, High-Frequency Properties of Semiconductors with Superlattices (Nauka, Moscow, 1989).
2. A. Yariv and P. Yeh, Optical Waves in Crystals: Propagation and Control of Laser Radiation (Wiley, New York, 1984; Mir, Moscow, 1987).
3. A. C. Baynham and A. D. Boardman, J. Phys. C. 2, 619 (1969).
4. V. L. Ginzburg, The Propagation of Electromagnetic Waves in Plasmas (Nauka, Moscow, 1967; Pergamon, Oxford, 1970).
5. R. S. Brazis, A. S. Mironas, and Yu. K. Pozhela, Litovsk. Fiz. Sb. 14(1), 95 (1974).