V. V. Bukin, S. V. Garnov, A. D. Trofimov, “Change in the spectrum of optical radiation transmitted through a plasma with an increase in the ionization degree”, Pis'ma v Zh. Èksper. Teoret. Fiz., 93:10 (2011), 629–631; JETP Letters, 93:10 (2011), 568–570
