1. V. I. Tatarskii, Propagation of Waves in a Turbulent Atmosphere [in Russian], Nauka, Moscow (1967).
2. J. E. Drumond, J. Atm. Terr. Phys.,9, Nos. 5?6, 282 (1956).
3. Ya. L. Al'pert, Propagation of Radio Waves in the Ionosphere [in Russian], Izd. AN SSSR, Moscow (1960).
4. Yu. A. Kravtsov and L. L. Goryshnik, Geomagnetism i Aéronomiya,9, 279 (1969).
5. V. L. Ginzburg, Propagation of Electromagnetic Waves in a Plasma [in Russian], Nauka, Moscow (1967).