@unpublished{publication-5325,
	author={Zweifel, Peter and Rischatsch, Maurus and Br{\"a}ndle, Angelika},
	institution={University of Zurich},
	number={No. 910},
	series={Working paper series / Socioeconomic Institute},
	title={GPs' preferences: What price fee-for-service?},
	year=2009,
}