1. R. Tanberg, Phys. Rev. 35, 1080 (1930).
2. A. A. Plyutto, V. V. Ryzhkov, and A. T. Kapin, Zh. Éksp. Teor. Fiz. 47, 494 (1964) [Sov. Phys. JETP 20, 328 (1964)].
3. G. M. Kassirov and G. A. Mesyats, Zh. Tekh. Fiz. 34, 1476 (1964) [Sov. Phys. Tech. Phys. 9, 1141 (1965)].
4. G. A. Mesyats, in Proceedings of the X International Conference on Phenomena in Ionized Gases, Oxford, 1971, Part 2, p. 333.
5. Ya. B. Zel’dovich and Yu. P. Raizer, Physics of Shock Waves and High-Temperature Hydrodynamic Phenomena, 2nd ed. (Nauka, Moscow, 1966; Academic, New York, 1966).