@unpublished{publication-5656,
	author={Meier, Stephan and Frey, Bruno S},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 181},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={Matching Donations - Subsidizing Charitable Giving in a Field Experiment},
	year=2004,
}