@unpublished{publication-7775,
	author={Ranehill, Eva and Schneider, Frédéric and Weber, Roberto A},
	institution={University of Zurich},
	issn={1664-7041},
	number=103,
	pages=44,
	series={Working paper series / Department of Economics},
	title={Growing groups, cooperation, and the rate of entry},
	year=2013,
}