1. I. S. Aleksakhin, G. G. Bogachev, I. P. Zapesochnyi, et al., Zh. Éksp. Teor. Fiz.,80, No. 6, 2187–2197.
2. Yu. M. Smirnov, Self-Ionization Phenomena in Atoms [in Russian], Moscow (1990), pp. 72–73.
3. S. Baier, M. Martins, B. R. Müller, ét al., J. Phys. B: At. Mol. Opt. Phys.,23, 3095–3104 (1990).
4. Yu. M. Smirnov, Physics of Electronic and Atomic Collisions [in Russian], Leningrad (1985), pp. 183–193.
5. Yu. M. Smirnov, Astron. Zh.,61, No. 6, 1087–1097 (1984).