Phys. Rev. Lett. 9, 439–443 (1962)Evidence for x Rays From Sources Outside the Solar System
See accompanying Physics Focus © 1962 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.9.439
DOI:
10.1103/PhysRevLett.9.439
PACS:
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