1. A. N. Kazantsev, D. S. Lukin, and Yu. G. Spiridonov, Kosm. Issled. 5, 593 (1967).
2. D. S. Lukin and Yu. G. Spiridonov, Radiotekh. Elektron. (Moscow) 14, 1673 (1969).
3. D. S. Lukin and E. A. Palkin, Numerical Canonical Method in Problems of Diffraction and Propagation of Electromagnetic Waves in Inhomogeneous Media (MFTI, Moscow, 1982) [in Russian].
4. A. S. Kryukovskii, D. S. Lukin, and D. V. Rastyagaev, Elektromagn. Volny Elektron. Sist. 14(8), 17 (2009).
5. V. E. Kunitsyn, E. D. Tereshchenko, and E. S. Andreeva, Radiotomography of the Ionosphere (Fizmatlit, Moscow, 2007) [in Russian].