1. G. A. Galazutdinov, Preprint No. 92, SAO RAN (Special Astrophysics Observatory of the Russian Academy of Sciences, Nizhny Arkhyz, 1992).
2. T. S. Galkina, “Spectral Observations of HD 206267, identified with X-ray source Ser X-4,” Izv. Krym. Astrofiz. Obs. 63, 86–92 (1981).
3. A. G. Masevich and A. V. Tutukov, Stellar Evolution: Theory and Observations (Nauka, Moscow, 1988) [in Russian].
4. X. M. Mikhailov, V. M. Khalilov, and I. A. Alekberov, “Echelle-spectrophotometer of Cassegrain focus of the 2-meter telescope at Shamakhi Astrophysical Observatory,” Tsirk. Shemakhin. Astrofiz. Obs. Nats. Akad. Nauk Az. 109, 21–30 (2005).
5. D. K. Rustamov and A. F. Abdulkerimova, “Asymmetry of the interstellar lines Na I λ 589.0 and 589.6 nm in the spectrum of the Wolf–Rayet type star HD 192163,” Kinematics Phys. Celestial Bodies 31, 100–104 (2015).