@unpublished{publication-4065,
	author={Backes-Gellner, Uschi and Werner, Arndt and Mohnen, Alwine},
	institution={University of Zurich},
	number=54,
	series={ISU Working Paper},
	title={Effort Provision in Entrepreneurial Teams:Effects of Team Size, Free-Riding and Peer Pressure},
	year=2005,
}