1. Gopka, V.F., Yushchenko, A.V., Mishenina, T.V., et al., Abundance Analysis of the Halo Star HD 221170 Atmosphere by the Synthetic Spectrum Technique, Astron. Zhurn., 2004, vol. 81, no. 7, pp. 635–647.
2. Radtsig, A.A. and Smirnov, B.M., Parametry atomov i ionov (Parameters of Atoms and Ions), Moscow: Atomizdat, 1986.
3. Shavrina, A.V., Polosuknina, N.S., Pavlenko, Ya.V., et al., Peculiarities in the Spectrum of the Unique roAp Star HD 101065 in the Region of the Lithium Resonance Doublet Line 6708 A, Astron. Zhurn., 2003, vol. 80, no. 7, pp. 624–630.
4. Yushchenko, A.V. and Gopka, V.F., On the Abundance of Heavy Elements in the Procyon Atmosphere, Pis’ma v Astron. Zhurn., 1996, vol. 22, no. 5–6, pp. 460–470.
5. Aller, M. and Cowley, C.R., The Possible Identification of Promethium in HR 465, Astrophys. J., 1970, vol. 162, no. 3, pp. 145–148.