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Ermentrout GB, Galán RF, Urban NN.Ermentrout GB, et al. Among authors: urban nn.Phys Rev Lett. 2007 Dec 14;99(24):248103. doi: 10.1103/PhysRevLett.99.248103. Epub 2007 Dec 14.Phys Rev Lett. 2007.PMID: 18233494Free PMC article.