@unpublished{publication-5333,
	author={Frey, Bruno S and Stutzer, Alois},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 417},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={Gl{\"u}ck: Die {\"o}konomische Analyse (Happiness: The Economic Analysis)},
	year=2009,
}