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3. Dorman, L. I. , 1958, Cosmic ray variations. Translation by U.S. Air Force Technical Documents Liaison Office.
4. Dorman, L. I. , and Feinberg, E. L. , 1958, On the nature of the cosmic ray variations. Memoria del V Congreso Internacional de Radiación Cósmica (Guanajuato, 1955), p. 393.