@unpublished{publication-11398,
	author={Burghart, Daniel R and Epper, Thomas and Fehr, Ernst},
	institution={University of Zurich},
	issn={1664-7041},
	number=179,
	pages=60,
	series={Working paper series / Department of Economics},
	title={The two faces of independence: betweenness and homotheticity},
	year=2014,
}