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Phys. Rev. Lett. Phys. Rev. A Phys. Rev. B Phys. Rev. C Phys. Rev. D Phys. Rev. E Phys. Rev. ST AB Phys. Rev. ST PER Phys. Rev. (Series I) Phys. Rev. Rev. Mod. Phys.
Vol.
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W. Baade and F. ZwickyMt. Wilson Observatory and California Institute of Technology, Pasadena.
Received 28 May 1934
©1934 The American Physical Society
URL: http://link.aps.org/abstract/PR/v46/p76/s2 DOI: 10.1103/PhysRev.46.76.2