@unpublished{publication-5209,
	author={Hepenstrick, Christian},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 519},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={Per-Capita Incomes and the Extensive Margin of Bilateral Trade},
	year=2010,
}