1. Ya. A. Al'pert, V. L. Ginzburg, and E. L. Feinberg, Propagation of Radio Waves [in Russian], Gostekhizdat, Moscow (1953).
2. V. P. Silin and A. A. Rukhadze, Electromagnetic Properties of Plasmas and Plasmalike Media [in Russian], Gostekhizdat, Moscow (1961).
3. V. I. Veksler, CERN Symposium, Geneva, Vol. 1 (1956), p. 80.
4. A. A. Kolomenskii, Zh. Eksp. Teor. Fiz.,24, 167 (1953).
5. A. G. Sitenko and A. A. Kolomenskii, Zh. Éksp. Teor. Fiz.,30, 511 (1956).