@unpublished{publication-5556,
	author={Buehler, Stefan and G{\"a}rtner, Dennis and Halbheer, Daniel},
	institution={University of Zurich},
	number={No. 402},
	series={Working paper series / Socioeconomic Institute},
	title={Deregulating Network Industries: Dealing with Price-Quality Tradeoffs},
	year=2005,
}