@unpublished{publication-5384,
	author={Fehr, Ernst and Leibbrandt, Andreas},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 378},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={Cooperativeness and Impatience in the Tragedy of the Commons},
	year=2008,
}