@inproceedings { santos18,
	booktitle = {In AAAI Conference on Artificial Intelligence (Student Track)},
	keywords = {Multi-Agent Societies;Game Theory;},
	pages = {8149-8150},
	publisher = {AAAI Press},
	series = {student track},
	title = { Indirect Reciprocity and Costly Reputation Building in Multiagent Systems },
	volume = {student track},
	year = {2018},
	author = {Fernando P. Santos and Jorge M. Pacheco and Francisco C. Santos}
}