@inbook{NBERc11074,
 Crossref = "NBERgert03-1",
 title = "Productivity Growth in the 2000s",
 author = "J. Bradford DeLong",
 BookTitle = "NBER Macroeconomics Annual 2002, Volume 17",
 Publisher = "MIT Press",
 pages = "113-158",
 year = "2003",
 month = "January",
 URL = "http://www.nber.org/chapters/c11074",
}
@book{NBERgert03-1,
 title = "NBER Macroeconomics Annual 2002, Volume 17",
 author = "Mark Gertler and Kenneth Rogoff",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "MIT Press",
 year = "2003",
 URL = "http://www.nber.org/books/gert03-1",
}