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Millikan, Robert A. and Neher, H. Victor and Pickering, William H. (1944) Further Studies on the Origin of Cosmic Rays Helium Annihilation Rays and the Cause of Their Variability with Time. Physical Review, 66 (11/12). pp. 295-302. ISSN 0031-899X. http://resolver.caltech.edu/CaltechAUTHORS:MILpr44