Abstract
THE problem of the origin of cosmic rays is well known; but in spite of considerable advances in knowledge concerning energetic extra-terrestrial objects in recent years, no satisfactory solution has appeared. It is not clear, even, whether the important sources are within the Galaxy or outside it1,2.
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STRONG, A., WOLFENDALE, A. & WDOWCZYK, J. Consequences of a Universal Cosmic-ray Theory for γ-ray Astronomy. Nature 241, 109–110 (1973). https://doi.org/10.1038/241109b0
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DOI: https://doi.org/10.1038/241109b0
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