1. E. S. Kukharkin, Electrophysics of Information Systems (Vysshaya Shkola, Moscow, 2001) [in Russian].
2. Introduction to Integrated Optics, Ed. by M. K. Barnoski (Plenum, New York, 1974; Mir, Moscow, 1977).
3. M. Herman, Semiconductor Superlattices (Akademie, Berlin, 1986; Mir, Moscow, 1989).
4. S. Akiba and K. Utaka, in Fundamentals of Semiconductor Lasers, Ed. by H. Takuma (Ohmsha, Tokyo, 1987; Mir, Moscow, 1989).
5. V. V. Dobrovitskii, A. K. Zvezdin, and A. F. Popkov, Usp. Fiz. Nauk 166, 439 (1996) [Phys. Usp. 39, 407 (1996)].