@article{TraxlerSpichtig2017, author = {Christian Traxler and Mathias Spichtig}, title = {Social Norms and the Indirect Evolution of Conditional Cooperation}, journal = {Journal of Economics}, volume = {102}, number = {3}, pages = {237 -- 262}, doi = {10.1007/s00712-010-0173-9}, year = {2017}, }