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    B. Rossi, High Energy Particles, Prentice-HaII, 1952.[2] S. Hayakawa, Cosmic Ray Physics, John Wiley and Sons, 1969.[3] J. C. Butcher et al., Nucl. Phys., 20(1960), 15[4] H. Messel et al., Electron-photon Shower Distribution Function, 1970.[5] 例如, 在Chiron型事例的研究中, 就是以不伴随或少伴随的大气级联作为低空事例的判据, 并由此估计强子的横动t.见S. Hasegawa; Proc.工nternational Symposium on Cosmic Rays and Partcle Physics,Tokyo (1984) 319.