Phys. Rev. 51, 884–886 (1937)Note on the Nature of Cosmic-Ray ParticlesReceived 30 March 1937; published in the issue dated May 1937 © 1937 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRev.51.884
DOI:
10.1103/PhysRev.51.884
PACS:
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