@unpublished{publication-5166,
	author={Barmettler, Franziska and Fehr, Ernst and Zehnder, Christian},
	institution={University of Zurich},
	issn={1664-7041},
	number={No. 27},
	series={Working paper series / Department of Economics},
	title={Big experimenter is watching you! Anonymity and prosocial behavior in the laboratory},
	year=2011,
}