1. V.G. Klochkova, V. E. Panchuk, and M.V. Yushkin, in Ul’trafioletovaya Vselennaya. II. (The Ultraviolet Universe. II), eds. B.M. Shustov, M.E. Sachkov, and E. Yu. Kil’pio (Moscow: Yanus-K, 2008), p. 46 (in Russian).
2. I. M. Kopylov, Izv. Krym. Astrofiz. Obs. 26, 232 (1961).
3. R. L. Kurucz, Astrophys. J. Suppl. 40, 1 (1979).
4. S. A. Gulyaev, V. E. Panchuk, et al., Astrof. Issled. (Izv. Spets. Astr.Obs.) 22, 3 (1986).
5. S. A. Gulyaev, O. G. Patimova, and V.V. Pleshakov, Astrof. Issled. (Izv. Spets.Astr. Obs.) 25, 55 (1987).