@inbook{NBERc12000,
 Crossref = "NBERcost10-1",
 title = "Premium Inventions: Patents and Prizes as Incentive Mechanisms in Britain and the United States, 1750-1930",
 author = "B. Zorina Khan",
 BookTitle = "Understanding Long-Run Economic Growth: Geography, Institutions, and the Knowledge Economy",
 Publisher = "University of Chicago Press",
 pages = "205-234",
 year = "2008",
 month = "November",
 URL = "http://www.nber.org/chapters/c12000",
}
@book{NBERcost10-1,
 title = "Understanding Long-Run Economic Growth: Geography, Institutions, and the Knowledge Economy",
 author = "Dora L. Costa and Naomi R. Lamoreaux",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2011",
 URL = "http://www.nber.org/books/cost10-1",
}