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Boamfa MI, Viertler K, Wewerka A, Stelzer F, Christianen PC, Maan JC.Boamfa MI, et al.Phys Rev Lett. 2003 Jan 17;90(2):025501. doi: 10.1103/PhysRevLett.90.025501. Epub 2003 Jan 14.Phys Rev Lett. 2003.PMID: 12570554Free article.