@unpublished{publication-5771,
	author={Frey, Bruno S and Stutzer, Alois},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 80},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={What can Economists learn from Happiness Research? Revised Version},
	year=2001,
}