@unpublished{publication-12230,
	author={Letina, Igor and Schmutzler, Armin},
	institution={University of Zurich},
	issn={1664-7041},
	number=200,
	pages=49,
	series={Working paper series / Department of Economics},
	title={Inducing variety: a theory of innovation contests},
	year=2019,
}