1. Ch. E. Moore, Atomic Energy Levels (National Bureau of Standards, Washington, 1949), Vols. 1, 2.
2. E. U. Condon and G. H. Shortley, The Theory of Atomic Spectra (Macmillan, New York, 1935; Inostrannaya Literatura, Moscow, 1949).
3. Handbuch der Physik, Vol. 27: Spektoskopie (Springer-Verlag, Berlin, 1964), pp. 84–280.
4. Takashi Nakajima and T. N. Chang, Z. Phys. D 36, 41 (1996).
5. G. P. Anisimova and E. L. Kapel’kina, Opt. Spektrosk. 84, 364 (1998) [Opt. Spectrosc. 84, 313 (1998)].