DOI:https://doi.org/10.1103/PhysRevLett.19.869
©1967 American Physical Society
J. G. Asbury*, U. Becker, William K. Bertram*,†, P. Joos, M. Rohde, and A. J. S. Smith*
C. L. Jordan and Samuel C. C. Ting‡
Vol. 19, Iss. 15 — 9 October 1967
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