@article { domingos20, journal = {Arxiv}, keywords = {Game Theory;Multi-Agent Societies;Social Robotic Companions;}, title = {Timing uncertainty in collective risk dilemmas encourages group reciprocation and polarization}, volume = {arXiv:2003.07317 (2020)}, year = {2020}, author = {Elias Fernandez Domingos and Jelena Grujic and Juan C. Burguillo and Georg Kirchsteiger and Francisco C. Santos and Tom Lenaerts} }