1. Yu. A. Tserkovnikov, Zh. Éksp. Teor. Fiz. 32, 67 (1957) [Sov. Phys. JETP 5, 58 (1957)].
2. L. I. Rudakov and R. Z. Sagdeev, Dokl. Akad. Nauk SSSR 138, 581 (1961) [Sov. Phys. Dokl. 6, 415 (1961)].
3. B. B. Kadomtsev and A. V. Timofeev, Dokl. Akad. Nauk SSSR 146, 581 (1962) [Sov. Phys. Dokl. 7, 826 (1963).
4. N. A. Krall, in Advances in Plasma Physics, Ed. by A. Simon and W. B. Thompson (Interscience, New York, 1968; Mir, Moscow, 1972), Vol. 1.
5. A. B. Mikhailovskii, Theory of Plasma Instabilities (Atomizdat, Moscow, 1971; Consultants Bureau, New York, 1974).