A Comment on the Letter by G. Goren et al., Phys. Rev. Lett. 63, 1237 (1989).
DOI:https://doi.org/10.1103/PhysRevLett.64.2588
©1990 American Physical Society
L. Kramer, E. Bodenschatz, and W. Pesch
Vol. 64, Iss. 21 — 21 May 1990
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