@article { vukov11,
	journal = {PLoS One},
	keywords = {Game Theory;Multi-Agent Societies;},
	number = {3},
	pages = {e17939},
	title = {Incipient Cognition Solves the Spatial Reciprocity Conundrum of Cooperation},
	volume = {6},
	year = {2011},
	author = {Jeromos Vukov and Francisco C. Santos and Jorge M Pacheco}
}