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2. R. A. McGee, Appl. Optics, 1, 649, 1962.
3. E. S. Kuznetsov, Izv. AN SSSR, ser. geofiz., 15, no. 3, 69, 1951.
4. I. S. Shklovskii, Physics of the Solar Corona [in Russian], GIFML, Moscow, 1962.
5. V, V. Stepanov, A Course in Differential Equations [in Russian], Moscow, 1959.