@unpublished{publication-5415,
	author={Bruhin, Adrian and Winkelmann, Rainer},
	institution={University of Zurich},
	number={No. 702},
	series={Working paper series / Socioeconomic Institute},
	title={Happiness Functions with Preference Interdependence and Heterogeneity: The Case of Altruism within the Family},
	year=2008,
}