@unpublished{publication-5310,
	author={Goeree, Jacob K and Holt, Charles A},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 436},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={Hierarchical Package Bidding: A Paper & Pencil Combinatorial Auction},
	year=2009,
}