1. S. Feneuille, M. Klapisch, E. Koenig, and S. Liberman, Physica A 48, 571 (1970).
2. J. E. Hansen, J. Phys. B 6(9), 1751 (1973).
3. A. V. Loginov and P. F. Gruzdev, Opt. Spektrosk. 45(5), 839 (1978) [Opt. Spectrosc. 45 (5), 725 (1978)].
4. B. Judd and B. Wyborn, Theory of Complex Atomic Spectra (Mir, Moscow, 1973) [in Russian].
5. G. P. Anisimova, E. L. Kapel’kina, R. I. Semenov, and V. I. Tuchkin, Opt. Spektrosk. 81(4), 543 (1996) [Opt. Spectrosc. 81 (4), 493 (1996)].