Phys. Rev. Lett. 12, 713–714 (1964)Broken Symmetries and Massless ParticlesReceived 30 March 1964; published in the issue dated 22 June 1964 © 1964 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.12.713
DOI:
10.1103/PhysRevLett.12.713
PACS:
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