A. V. Kozyrev, E. M. Baranova, V. Yu. Kozhevnikov, N. S. Semenyuk, “Variation of the beam parameters of runaway electrons in a gas discharge under the conditions of nonuniform preliminary ionization”, Pisma v Zhurnal Tekhnicheskoi Fiziki, 43:17 (2017), 56–63; Tech. Phys. Lett., 43:9 (2017), 804–807
