Abstract
THE controversy over the question of the origin of energetic cosmic rays is well known. There are those who believe that the bulk of the radiation comes from Galactic sources, such as supernovae1 and others2 who find rather good reasons for supposing that the radiation comes primarily from extragalactic sources. In an intermediate group there are those3 who think that perhaps only the most energetic particles (E>1018eV) are derived from extra galactic sources.
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DODDS, D., STRONG, A., WOLFENDALE, A. et al. Relevance of cosmic gamma-rays to origin of the cosmic radiation. Nature 250, 716–717 (1974). https://doi.org/10.1038/250716a0
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DOI: https://doi.org/10.1038/250716a0
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