@unpublished{publication-5585,
	author={Halbheer, Daniel and Niggli, Sarah and Schmutzler, Armin},
	institution={University of Zurich},
	number={No. 304},
	series={Working paper series / Socioeconomic Institute},
	title={What does it take to sell Environmental Policy? An empirical Analysis of Referendum Data},
	year=2005,
}