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Science 29 June 2007:
Vol. 316. no. 5833, pp. 1905 - 1907
DOI: 10.1126/science.1141588


Via Freedom to Coercion: The Emergence of Costly Punishment
Christoph Hauert, Arne Traulsen, Hannelore Brandt, Martin A. Nowak, Karl Sigmund

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