DOI:https://doi.org/10.1103/PhysRevLett.9.114
©1962 American Physical Society
G. M. Pjerrou, D. J. Prowse, P. Schlein, W. E. Slater, D. H. Stork, and H. K. Ticho
Vol. 9, Iss. 3 — 1 August 1962
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