1. G. A. Askar’yan, Sov. Phys. JETP 14, 441 (1961).
2. G. A. Askar’yan, Sov. Phys. JETP 21, 658 (1965).
3. F. D. Kahn and I. Lerche, Proc. R. Soc. London, Ser. A 289, 206 (1966).
4. A. von Engel, Ionized Gases (Clarendon, Oxford, 1955; Fizmatlit, Moscow, 1959).
5. Yu. P. Raizer, Principles of the Modern Physics of Gas Discharge Processes (Nauka, Moscow, 1980) [in Russian].