@inbook{NBERc8412,
 Crossref = "NBERshov08-1",
 title = "Old Europe Ages: Reforms and Reform Backlashes",
 author = "Axel Börsch-Supan and Alexander Ludwig",
 BookTitle = "Demography and the Economy",
 Publisher = "University of Chicago Press",
 pages = "169-204",
 year = "2010",
 month = "November",
 URL = "http://www.nber.org/chapters/c8412",
}
@book{NBERshov08-1,
 title = "Demography and the Economy",
 author = "John B. Shoven",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2011",
 URL = "http://www.nber.org/books/shov08-1",
}