1. A. Kramida, Yu. Ralchenko, J. Reader, and NIST ASD Team, NIST Atomic Spectra Database, Vers. 5.2 (2014). http://physics.nist.gov/asd.
2. E. Biemont, M. Clar, S. Y. Enzonga, V. Fivet, P. Quinet, E. Träbert, and H.-P. Garnir, Can. J. Phys. 87, 1275 (2009).
3. A. V. Loginov and V. I. Tuchkin, Opt. Spectrosc. 86, 148 (1999).
4. A. V. Loginov, Opt. Spectrosc. 67, 288 (1989).
5. A. V. Loginov, Opt. Spectrosc. 93, 649 (2002).