@article { santos12,
	journal = {Journal of Theoretical Biology},
	keywords = {Game Theory;Multi-Agent Societies;Miscellaneous;},
	pages = {81-86},
	title = {Dynamics of N-Person Snowdrift Games in Structured Populations},
	volume = {315},
	year = {2012},
	author = {Marta D. Santos and Flávio L. Pinheiro and Francisco C. Santos and Jorge M. Pacheco}
}