@article{publication-4639,
	author={Rangel, Antonio and Krajbich, Ian Michael and Camerer, Colin  and Ledyard, J O},
	issn={0036-8075 },
	journal={Science},
	number=5952,
	pages={596-599},
	publisher={Highwire Press},
	title={Using Neural Measures of Economic Value to Solve the Public Goods Free-Rider Problem},
	volume=326,
	year=2009,
}