1. G. R. Wight, C. E. Brion, and M. J. Van der Wiel, J. Electron. Spectrosc. 1, 457 (1972).
2. A. S. Vinogradov, B. Shlarbaum, and T. M. Zimkina, Opt. Spektrosk. 36, 658 (1974).
3. A. S. Vinogradov, T. M. Zimkina, V. N. Akimov, and B. Shlarbaum, Izv. Akad. Nauk SSSR, Ser. Fiz. 38, 508 (1974).
4. V. N. Akimov, A. S. Vinogradov, and A. V. Zhadenov, Opt. Spektrosk. 65, 349 (1988) [Opt. Spectrosc. 65, 210 (1988)].
5. F. Wuilleumier and M. O. Krause, in Proceedings of the International Conference on Inner-shell Ionization Phenomena, Inst. of Technology, Georgia, 1972, p. 773.