Dreber, AnnaRand, David G.Fudenberg, DrewNowak, Martin2008-11-102008Dreber, Anna, David G. Rand, Drew Fudenberg, and Martin A. Nowak. Winners don't punish. Nature 452: 335-348.0028-0836 0302-2889http://nrs.harvard.edu/urn-3:HUL.InstRepos:2252594en-USJournal Article