1. Ju. Gavriljuk et al., in Proceedings of the Ninth International School in Particles and Cosmology, Baksan Valley, Kabardino-Balkaria, Russia, 1997 (Inst. Yad. Issled., Moscow, 1998), p. 415.
2. Ju. Gavriljuk et al., Yad. Fiz. 61, 1389 (1998) [Phys. At. Nucl. 61, 1287 (1998)].
3. M. Aunola and J. Suchonen, Nucl. Phys. A 602, 133 (1996).
4. M. Hirsch et al., Z. Phys. A 347, 151 (1994).
5. O. Rumyantsev and M. Urin, Phys. Lett. B 443, 51 (1998).