1. V. F. Gopka and O. M. Ulyanov, “About the hypothesis explaining the phenomenon of Przybylski’s star,” Bull. Crimean Astrophys. Observatory 104, 225–226 (2008).
2. A. V. Yushchenko, Heavy Elements in the Atmospheres of Peculiar Stars, Doctoral Dissertation in Astrophysics and Radioastronomy (Odessa, 2017).
3. M. Asplund, N. Grevesse, A. Sauval, and P. Scott, “The chemical composition of the Sun,” Annu. Rev. Astron. Astrophys. 47, 481–522 (2003).
4. F. Castelli and R. L. Kurucz, “New grids of ATLAS9 model atmospheres,” in Modelling of Stellar Atmospheres: Proc. 210th Symp. of the International Astronomical Union, Uppsala, Sweden, June 17–21,
2002, Ed. by N. Piskunov, W. W. Weiss, and D. F. Gray (Astronomical Society of the Pacific, San Francisco, Calif., 2003), poster A20.
5. S. C. Engle, The Secret Lives of Cepheids. A Multi-Wavelength Study of the Atmospheres and Real-Time Evolution of Classical Cepheids, Doctoral Dissertation in Physics (James Cook Univ., Australia, 2014).