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Beg QK, Vazquez A, Ernst J, de Menezes MA, Bar-Joseph Z, Barabási AL, Oltvai ZN.Beg QK, et al. Among authors: oltvai zn.Proc Natl Acad Sci U S A. 2007 Jul 31;104(31):12663-8. doi: 10.1073/pnas.0609845104. Epub 2007 Jul 24.Proc Natl Acad Sci U S A. 2007.PMID: 17652176Free PMC article.