@unpublished{publication-3639,
	author={Unger, B and Pull, K and Backes-Gellner, Uschi},
	institution={University of Zurich},
	issn={1660-1157},
	number=130,
	pages=13,
	series={ISU Working Paper},
	title={Composition and performance of research training groups},
	year=2010,
}