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Carpena P, Bernaola-Galván P, Ivanov PCh.Carpena P, et al.Phys Rev Lett. 2004 Oct 22;93(17):176804. doi: 10.1103/PhysRevLett.93.176804. Epub 2004 Oct 20.Phys Rev Lett. 2004.PMID: 15525105