IZA Publications
IZA Discussion Paper No. 712
published in: P. Hammerstein (ed.), Genetic and Cultural Evolution of Cooperation, Cambridge: MIT Press, 2004
IZA Discussion Paper No. 507
published in: European Economic Review, 2002, 46 (4-5), 687-724
IZA Discussion Paper No. 174
published in: American Economic Review, 2001, 91 (5), 1239-1262
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