A Comment on the Letter by Burger et al., Phys. Rev. Lett. 86, 4447 (2001). The authors of the Letter offer a Reply.
DOI:https://doi.org/10.1103/PhysRevLett.89.088901
©2002 American Physical Society
Biao Wu1,2 and Qian Niu1
Vol. 89, Iss. 8 — 19 August 2002
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