@unpublished{publication-5809,
	author={Fischbacher, Urs and G{\"a}chter, Simon and Fehr, Ernst},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 16},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={Are People Conditionally Cooperative? Evidence from a Public Goods Experiment},
	year=2000,
}