@unpublished{publication-5722,
	author={Frey, Bruno S and Benz, Matthias and Stutzer, Alois},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 129},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={Introducing Procedural Utility: Not only What, but also How Matters},
	year=2002,
}