DOI:https://doi.org/10.1103/PhysRevLett.20.748
©1968 American Physical Society
A. W. Wehmann*, E. Engels, Jr., C. M. Hoffman, P. G. Innocenti, and Richard Wilson
W. A. Blanpied
D. J. Drickey
L. N. Hand
D. G. Stairs
Vol. 20, Iss. 14 — 1 April 1968
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