1. S. S. Pop, Diagnostics of a Surface by Ion Beams [in Russian], Uzhgorod (1977), p. 173.
2. G. E. Thomas and E. E. Kluizenaar, Int. J. Mass Spectrom. Ion Phys.,15, No. 2, 165?179 (1974).
3. V. V. Braslavets, S. A. Avdokimov, Yu. A. Bandurin, et al., Pis'ma Zh. Tekh. Fiz.,12, No. 9, 543?547 (1986).
4. E. O. Rausch, A. I. Bazin, and E. W. Thomas, J. Chem. Phys.,65, No. 11, 4447?4454 (1976).
5. S. A. Evdokimov, V. Ch. Drobnich, and S. S. Pop, Ukr. Fiz. Zh.,27, No. 5, 744?747 (1982).