DOI:https://doi.org/10.1103/PhysRevLett.71.300
©1993 American Physical Society
R. Dippel, D. P. Woodruff, X-M. Hu, M. C. Asensio, A. W. Robinson, K-M. Schindler, K-U. Weiss, P. Gardner, and A. M. Bradshaw
Vol. 71, Iss. 2 — 12 July 1993
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