@inproceedings { santos18, booktitle = {In AAAI Conference on Artificial Intelligence}, keywords = {Multi-Agent Societies;Game Theory;}, pages = {4727-4734}, publisher = {AAAI Press}, title = {Social Norms of Cooperation With Costly Reputation Building}, year = {2018}, author = {Fernando P. Santos and Jorge M. Pacheco and Francisco C. Santos} }