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Social Sciences - Social Sciences - Biological Sciences - Evolution:
Jia-Jia Wu,
Bo-Yu Zhang,
Zhen-Xing Zhou,
Qiao-Qiao He,
Xiu-Deng Zheng,
Ross Cressman,
and Yi Tao
Costly punishment does not always increase cooperationPNAS 2009106:17448-17451; published online before print September 28, 2009,doi:10.1073/pnas.0905918106
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