Five rules for the evolution of cooperation by Martin A. Nowak
= Five rules for the evolution of cooperation by Martin A. Nowak
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By <Martin A. Nowak>.
https://pmc.ncbi.nlm.nih.gov/articles/PMC3279745/
Verified locator: Science 314 (2006), 1560–1563; DOI 10.1126/science.1133755. Direct reciprocity, equation 2; supporting material gives the donation-game payoff matrices.