DOI:https://doi.org/10.1103/PhysRevLett.70.2050
©1993 American Physical Society
A. J. Read, R. J. Needs, K. J. Nash, L. T. Canham, P. D. J. Calcott, and A. Qteish
Vol. 70, Iss. 13 — 29 March 1993
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