Phys. Rev. Lett. 12, 266–268 (1964)Does Spontaneous Breakdown of Symmetry Imply Zero-Mass Particles?Received 8 January 1964; published in the issue dated 9 March 1964 © 1964 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.12.266
DOI:
10.1103/PhysRevLett.12.266
PACS:
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