1. 1. Afraimovich, E. L., 1982. Interference methods of radio sounding of the ionosphere. Moscow: Nauka Publ.(in Russian).
2. 2. Gershman, B. N., 1974. Dynamics of ionospheric plasma. Moscow: Nauka Publ. (in Russian).
3. Ionospheric Radio
4. Ionospheres
5. 5. Ginzburg, V. L., 1967. The propagation of electromagnetic waves in a plasma. Moscow: Science Publ. (in Russian).