@inbook{NBERc10699,
 Crossref = "NBERgrub04-1",
 title = "Micro-Modeling of Retirement in Belgium",
 author = "Arnaud Dellis and Raphaël Desmet and Alain Jousten and Sergio Perelman",
 BookTitle = "Social Security Programs and Retirement around the World: Micro-Estimation",
 Publisher = "University of Chicago Press",
 pages = "41-98",
 year = "2004",
 month = "January",
 URL = "http://www.nber.org/chapters/c10699",
}
@book{NBERgrub04-1,
 title = "Social Security Programs and Retirement around the World: Micro-Estimation",
 author = "Jonathan Gruber and David A. Wise",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2004",
 URL = "http://www.nber.org/books/grub04-1",
}