1. V. L. Ginzburg, Izv. Izv. Akad. Nauk SSSR, Ser. Fiz. 11, 1651 (1947).
2. H. Motz, W. Thon, and R. N. J. Whitehurst, Appl. Phys. 24, 826 (1953).
3. L. A. Artsimovich and I. Ya. Pomeranchuk, Zh. Eksp. Teor. Fiz. 16, 379 (1946).
4. I. M. Ternov, V. V. Mikhailin, and V. R. Khalilov, Synchrotron Radiation and Its Applications (Mosk. Gos. Univ., Moscow, 1980) [in Russian].
5. D. F. Alferov, Yu. A. Bashmakov, and E. G. Bessonov, Sov. Phys. Tech. Phys. 18, 336 (1974).