@inbook{NBERc9746,
 Crossref = "NBERfeld02-1",
 title = "Introduction to "The Distributional Aspects of Social Security and Social Security Reform"",
 author = "Martin S. Feldstein and Jeffrey B. Liebman",
 BookTitle = "The Distributional Aspects of Social Security and Social Security Reform",
 Publisher = "University of Chicago Press",
 pages = "1-10",
 year = "2002",
 month = "January",
 URL = "http://www.nber.org/chapters/c9746",
}
@book{NBERfeld02-1,
 title = "The Distributional Aspects of Social Security and Social Security Reform",
 author = "Martin Feldstein and Jeffrey B. Liebman",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2002",
 URL = "http://www.nber.org/books/feld02-1",
}