A. Ya. Faenov, S. A. Pikuz, A. G. Zhidkov, I. Yu. Skobelev, P. S. Komarov, O. V. Chefonov, S. V. Gasilov, A. V. Ovchinnikov, “Excitation of X rays by electrons accelerated in air in the wake wave of a laser pulse”, Pis'ma v Zh. Èksper. Teoret. Fiz., 92:6 (2010), 415–419; JETP Letters, 92:6 (2010), 375–378
