1. L. Huxley and J. Ratcliffe, Proc. Inst. Elect. Eng.,96, 443 (1949).
2. I. S. Shlyuger, Zh. Éksp. Teor. Fiz., Piz'ma Red.,19, 274 (1974); A. V. Gurevich and I. S. Shlyuger. Izv. Vyssh. Uchebn. Zaved., Radiofiz.,18, No. 9, 1237 (1975).
3. V. L. Ginzburg and A. V. Gurevich, Usp. Fiz. Nauk,70, 201, 393, (1960); A. V. Gurevich and A. B. Shvartsburg, Nonlinear Theory of the Propagation of Radio Waves in the Ionosphere [in Russian], Izd. Nauka, Moscow (1973).
4. A. V. Gurevich, G. M. Milikh, and I. S. Shlyuger, Zh. Éksp. Teor. Fiz.,69, 1640 (1975); Zh. Éksp. Teor. Fiz., Pis'ma Red.,23, 395 (1976).
5. W. F. Utlaut, E. J. Violette, and L. L. Melanson, Radio Sci.,9, 1033 (1974).