• [1]

    A. M. Hillas Proc. of the Cosmic Ray Workshop, Uni. of Utah (1983) 1.[2] J. P.W efel Proc. of the Cosmic Ray Workshop, Uni. of Z.Jtah (1983), 188.[3] R. K.Sood, Nature 301(1983), 44.[4] M.Siman et al., Astrophys. J., 239(1980), 712.[5] JACEE Collaboration Proc. of Inter. Symp. on Cosmic Rays and Particles Phys. Tokyo, (1984).468.[6] W. R. Webber in Composition and Origin of Cosmic Rays D. Reidel Publishing Company, Dordrecht, (1983).[7] M. Anienomori et al. Proc, of Inter. Symp.on Cosmic Rays and Particles Phys. Tokyo, (1984),494.[8] N. Nagano et al., J. Phys. G: Nucl. Phys., 10(1984), 1295.