• [1]

    W. Galbraith J. V. Jelley, J.Atmos. Terres. Phys. 6(1955), 250.[2] D. H. Hartman et al, Nuovo Cimersto, 51A(1979), 131.[3] V. I. Zatsepin A. E. Chudakov, Soviet Phys. JETP, 15(1962), 1176.[4] Giler et al., Proc. 13th ICCR, 3(1973), 2366.[5] Anderson et al., Bri. Jour. A. Phys. 5(1953).[6] G. Clark et al., Proc. of ICCR, 4(1963), 65.[7] Efimov, Proc. 16th ICCR, 8(1979), 154.[8] G. T. Zatsepin et al., Proc.of ICCR, 4(1963), 100.[9] C. Gerders et al., Proc. 13th ICCR, 3(1973), 219.