@article { han13,
	journal = {Scientific Reports, Nature Pub. Group},
	keywords = {Game Theory;Multi-Agent Societies;Miscellaneous;},
	month = {in press},
	number = {2695},
	title = {Good agreements make good friends},
	volume = {3},
	year = {2013},
	author = {The Anh Han and Luis Moniz Pereira and Francisco C. Santos and Tom Lenaerts}
}