DOI:https://doi.org/10.1103/PhysRevLett.16.469
©1966 American Physical Society
J. Cerny, S. W. Cosper, G. W. Butler, R. H. Pehl, F. S. Goulding, D. A. Landis, and C. Détraz*
Vol. 16, Iss. 11 — 14 March 1966
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