DOI:https://doi.org/10.1103/PhysRevLett.18.526
©1967 American Physical Society
A. Barna, J. Cox, F. Martin, M. L. Perl, T. H. Tan, W. T. Toner, T. F. Zipf, and E. H. Bellamy
Vol. 18, Iss. 13 — 27 March 1967
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