Evolution of In-Group Favoritism

Evolution of In-Group Favoritism
F. Fu, C.E. Tarnita, N.A. Christakis, L. Wang, D.G. Rand, and M.A. Nowak, "Evolution of In-Group Favoritism," Nature Scientific Reports, 2: 460 (June 2012); http://dx.doi.org/10.1038/srep00460
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