1. D. P. Bhattacharyya, Pratibha Pal andA. Mukhopadhyay:Aust. J. Phys.,37, 575 (1984).
2. S. Hayakawa:Cosmic Ray Physics (Wiley Interscience Publ., London, 1969).
3. K. Kobayakawa: private communication (1984).
4. K. Kobayakawa:Proceedings of the XIII International on Cosmic Rays Conference, Vol.5 (Denver, 1973), p. 3156.
5. J. N. Capdevielle andD. P. Bhattacharyya:Physique theorique, Université de Bordeaux I, preprint No. 140 (1984);