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Gallup AC, Hale JJ, Sumpter DJ, Garnier S, Kacelnik A, Krebs JR, Couzin ID.Gallup AC, et al. Among authors: krebs jr.Proc Natl Acad Sci U S A. 2012 May 8;109(19):7245-50. doi: 10.1073/pnas.1116141109. Epub 2012 Apr 23.Proc Natl Acad Sci U S A. 2012.PMID: 22529369Free PMC article.