Phys. Rev. Lett. 1, 254–255 (1958)Sign of the Gravitational Mass of a PositronReceived 2 September 1958; published in the issue dated 1 October 1958 © 1958 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.1.254
DOI:
10.1103/PhysRevLett.1.254
PACS:
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