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Trallero-Herrero C, Cohen JL, Weinacht T.Trallero-Herrero C, et al.Phys Rev Lett. 2006 Feb 17;96(6):063603. doi: 10.1103/PhysRevLett.96.063603. Epub 2006 Feb 16.Phys Rev Lett. 2006.PMID: 16605994