Phys. Rev. Lett. 10, 66–68 (1963)Asymptotic Properties of Fields and Space-TimesReceived 14 December 1962; published in the issue dated 15 January 1963 © 1963 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.10.66
DOI:
10.1103/PhysRevLett.10.66
PACS:
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