A Comment on the Letter by J. Choi and J. V. José, Phys. Rev. Lett. 62, 320 (1989).
DOI:https://doi.org/10.1103/PhysRevLett.63.1023
©1989 American Physical Society
M. Y. Choi
Vol. 63, Iss. 9 — 28 August 1989
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