@unpublished{publication-5704,
	author={Falk, Armin and Kosfeld, Michael},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 146},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={It's all about Connections: Evidence on Network Formation},
	year=2003,
}