@unpublished{publication-5171,
	author={Kube, Sebastian and Maréchal, Michel and Puppe, Clemens},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 377},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={The Currency of Reciprocity - Gift-Exchange in the Workplace},
	year=2011,
}