1. M. P. Dolukhanov, Propagation of Radio Waves (Sovetskoe Radio, Moscow, 1972) [in Russian].
2. A. I. Kalinin and E. L. Cherenkova, Propagation of Radio Waves and Operation of Radio Links (Svyaz’, Moscow, 1971) [in Russian].
3. Ya. L. Al’pert, Propagation of Radio waves and the Ionosphere (Akad. Nauk SSSR, Moscow, 1960) [in Russian].
4. N. V. Ryabova, in Proc. Int. Baikal Youth Sci. School on Fundamental Physics, (BShFF-2006), Irkutsk, Sept. 11–16, 2006 (ISEF Sib. Otd. RAN, Irkutsk, 2006).
5. HFPRO: A Complex for Prediction of Ionospheric Transmission of Short Radio Waves for a System of Radio Links, Version 3.0. (IZMIRAN, Troitsk, 1997).