1. S. I. Nikolsky, Nucl. Phys. B (Proc. Suppl.) 39A, 228 (1995); 75A, 217 (1999).
2. Particle Data Group, Eur. Phys. J. C 15, 155 (2000).
3. A. A. Petrukhin, in Proceedings of the XI Rencontres de Blois “Frontiers of Matter,” Blois, France, 1999 (Gioi Publ., Vietnam, 2001), p. 401.
4. T. Matano et al., in Proceedings of the International Conference on Cosmic Rays, London, 1965, Vol. 2, p. 1045.
5. N. P. Il'ina et al., in Proceedings of the 24th International Cosmic Ray Conference, Rome, Italy, 1995, Vol. 1, p. 524.