American Physical Society, Physical Review Letters, 18(97), 2006
DOI: 10.1103/physrevlett.97.189802
American Physical Society, Physical Review Letters, 18(97), 2006
DOI: 10.1103/physrevlett.97.189801
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A Comment on the Letter by Li Liu et al., Phys. Rev. Lett. 95, 117802 (2005)PRLTAO0031-900710.1103/PhysRevLett.95.117802. The authors of the Letter offer a Reply.