@unpublished{publication-5479,
	author={Frey, Bruno S and Stutzer, Alois},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 306},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={Should National Happiness Be Maximized ?},
	year=2007,
}