1. K. V. Kazanskii, Terrestrial Refraction over Vast Water Surfaces [in Russian], Gidrometeoizdat, Leningrad (1966).
2. I. G. Kolchinskii, Light Refraction in the Earth’s Atmosphere [in Russian], Naukova Dumka, Kiev (1967).
3. A. I. Nefed’eva, Izv. Astron. Obs. im. Énge’ gardta, No. 36, p. 3 (1968).
4. I. F. Kushtin, Refraction of Light Rays in the Atmosphere [in Russian], Nedra, Moscow (1971).
5. V. Numerova, Byull. Astron. Inst., No. 35 (1934).