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Science 29 October 2004:
Vol. 306. no. 5697, pp. 859 - 862
DOI: 10.1126/science.1101456


Abstract
Full Text 		The Evolutionary Origin of Cooperators and Defectors
M. Doebeli, C. Hauert, T. Killingback

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Science. ISSN 0036-8075 (print), 1095-9203 (online)