Armin Falk, Urs Fischbacher. A theory of reciprocity. Games and Economic Behavior, 54(2):293-315, 2006. [doi]
@article{FalkF06, title = {A theory of reciprocity}, author = {Armin Falk and Urs Fischbacher}, year = {2006}, doi = {10.1016/j.geb.2005.03.001}, url = {http://dx.doi.org/10.1016/j.geb.2005.03.001}, researchr = {https://researchr.org/publication/FalkF06}, cites = {0}, citedby = {0}, journal = {Games and Economic Behavior}, volume = {54}, number = {2}, pages = {293-315}, }