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3. Ya. L. Al’pert, Radio Wave Propagation and Ionosphere (Akad. Nauk SSSR, Moscow, 1960) [in Russian].
4. M. V. Ladanov, A. M. Vedishchev, S. V. Kizima, G. V. Lavrov, Elektrosvyaz’, No. 9, 3 (2012).
5. S. V. Kizima and M. V. Ladanov, Radiochastot. Spektr, No. 2, 32 (2012).