1. A. A. Andronov and V. Yu. Trakhtengerts, Geomagn. Aéronom. 4, 233 (1964).
2. C. F. Kennel and H. E. Petschek, J. Geophys. Res. 71, 1 (1966).
3. V. Yu. Trakhtengerts, Geomagn. Aéronom. 3, 442 (1963).
4. R. Z. Sagdeev and V. D. Shafranov, Zh. Éksp. Teor. Fiz. 39, 181 (1960) [Sov. Phys. JETP 12, 130 (1960)].
5. P. A. Bespalov and V. Yu. Trakhtengerts, Alfvén Masers (IPF AN SSSR, Gorki, 1986) [in Russian].