-
[1]
P. Bassi, G. Clark, and B. Rossi, Phys. Rev., 92 (1953), 441.[2] G. Clark, H. Bradt, and M. La Pointe, Proc. 8th Int. Cosmic Ray Conf., Jaipur 4 (1963), 65.[3] C. B. A. McCuslcer, Proc. 8th Int. Cosmic ray Conf., Jaipur 4 (1963), 35.[4] S. Hayakawa, Cosmic Ray Physics, Wiley-Interscience (1969). ,[5] Ph. Catz et al., Proc. 14th Int. Cosmic Rag Conf., Munich 12 (1975),4329.[6] F. Ashton et al., Proc. 16th Tnt. Cosmic Ray Conf., Kyoto 13 (1979),243.[7] P. C. Crouch et al., Nucl. Instr. and Meth., 179(1981), 467.[8] C. B. A. McCusker and M. M. Winn, Nucl. Phys., 5(1979), 159.