1. H. V. Argo, J. R. Asbridge, S. J. Bame, et al., J. Geophys. Res. 72, 1989 (1967).
2. E. G. Berezhko, V. K. Elshin, G. F. Krymskii, and S. I. Petukhov, Generation of Cosmic Rays by Shock Waves (Nauka, Novosibirsk, 1988) [in Russian].
3. E. G. Berezhko and G. F. Krymskii, Usp. Fiz. Nauk 154, 49 (1988) [Sov. Phys. Usp. 31, 27 (1988)].
4. E. G. Berezhko and S. N. Taneev, Kosm. Issled. 29, 582 (1991a).
5. E. G. Berezhko and S. N. Taneev, in Proceedings of the 22nd International Conference on Cosmic Rays 3, 276 (1991b).