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Gómez-Gardeñes J, Campillo M, Floría LM, Moreno Y.Gómez-Gardeñes J, et al.Phys Rev Lett. 2007 Mar 9;98(10):108103. doi: 10.1103/PhysRevLett.98.108103. Epub 2007 Mar 7.Phys Rev Lett. 2007.PMID: 17358570