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2. Cherkasov, I. I., Kemurjian, A. L., Mikhailov, L. N., Mikheyev, V. V., Morozov, A. A., Musatov, A. A., Savenko, I. A., Smorodinov, M. I., and Shvarev, V. V.: 1967,Kosmich. Issled 5, 746. Translated inCosmic Res. 5, 636.
3. Cherkasov, I. I., Gromov, V. V., Zobachev, N. M., Musatov, A. A., Mikheyev, V. V., Petrukhin, V. P., and Shvarev, V. V.: 1968a,Dokl. Akad. Nauk. SSSR 179, 829. Translated inSoviet Phys. Dokl. 13, 336.
4. Cherkasov, I. I., Mikhailov, L. N., Morozov, A. A., Petrukhin, V. P., Shvarev, V. V., Mihkeyev, V. V., Smorodinov, M. I., and Zobachev, N. M.: 1968b,Inzh. Fiz. Zh. 14, 581.
5. Choate, R., Batterson, S. A., Christensen, E. M., Hutton, R. E., Jaffe, L. D., Jones, R. H., Ko, H. Y., Spencer, R. L., and Sperling, F. B.: 1969,J. Geophys. Res. 74, 6149.