@inbook{NBERc10669,
 Crossref = "NBERfeld02-2",
 title = "Different Approaches to Pension Reform from an Economic Point of View",
 author = "Jonathan Gruber and David A. Wise",
 BookTitle = "Social Security Pension Reform in Europe",
 Publisher = "University of Chicago Press",
 pages = "49-84",
 year = "2002",
 month = "January",
 URL = "http://www.nber.org/chapters/c10669",
}
@book{NBERfeld02-2,
 title = "Social Security Pension Reform in Europe",
 author = "Martin Feldstein and Horst Siebert",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2002",
 URL = "http://www.nber.org/books/feld02-2",
}