@inbook{NBERc10801,
 Crossref = "NBERjaff04-1",
 title = "Prospects for Improving U.S. Patent Quality via Postgrant Opposition",
 author = "Bronwyn H. Hall and Stuart Graham and Dietmar Harhoff and David C. Mowery",
 BookTitle = "Innovation Policy and the Economy, Volume 4",
 Publisher = "The MIT Press",
 pages = "115-144",
 year = "2004",
 month = "February",
 URL = "http://www.nber.org/chapters/c10801",
}
@book{NBERjaff04-1,
 title = "Innovation Policy and the Economy, Volume 4",
 author = "Adam B. Jaffe and Josh Lerner and Scott Stern",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "The MIT Press",
 year = "2004",
 URL = "http://www.nber.org/books/jaff04-1",
}