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3. L. P. Babich, E. N. Donskoy, R. I. Il’kaev, I. M. Kutsyk, and R. A. Roussel-Dupre, “Fundamental Characteristics of Runaway Relativistic Electron Avalanche in the Air,” Fiz. Plazmy 30(6), 666–674 (2004).
4. E. M. Bazelyan and Yu. P. Raizer, Physics of Lightning and Lightning Protection (Fizmatlit, Moscow, 2001) [in Russian].
5. G. A. Bethe and Yu. Ashkin, “Emission Propagation through a Substance,” in Experimental Nuclear Physics, Ed. by E. Segre (Inostrannaya Literatura, Moscow, 1955), pp. 141–298.