A Comment on the Letter by Q. Su et al., Phys. Rev. Lett. 64, 862 (1990).
DOI:https://doi.org/10.1103/PhysRevLett.65.1964
©1990 American Physical Society
R. V. Jensen
B. Sundaram
Vol. 65, Iss. 15 — 8 October 1990
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