1. G. V. Golubkov and G. K. Ianov, Rydberg States of Atoms and Molecules and Elementary Processes with their Participation (URSS, Moscow, 2001) [in Russian].
2. Rydberg States of Atoms and Molecules, Ed. by R. F. Stebbings and F. B. Dunning (Cambridge Univ. Press, Cambridge, 1983; Mir, Moscow, 1985).
3. G. K. Ivanov and G. V. Golubkov, Sov. Phys. JETP 72, 783 (1991).
4. J. N. Hirschfelder, Adv. Chem. Phys.: Laser Mol. Meth. 73, 1 (1989).
5. N. B. Delone, V. P. Krainov, and D. L. Shepelyanskii, Sov. Phys. Usp. 26, 551 (1983).