DOI:https://doi.org/10.1103/PhysRevLett.78.4137
©1997 American Physical Society
T. Schmidt, R. J. Haug, Vladimir I. Fal'ko, K. v. Klitzing, A. Förster, and H. Lüth
Vol. 78, Iss. 21 — 26 May 1997
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