@inbook{NBERc6255,
 Crossref = "NBERfeld98-1",
 title = "Administrative Costs in Public and Private Retirement Systems",
 author = "Olivia S. Mitchell",
 BookTitle = "Privatizing Social Security",
 Publisher = "University of Chicago Press",
 pages = "403-456",
 year = "1998",
 month = "January",
 URL = "http://www.nber.org/chapters/c6255",
}
@book{NBERfeld98-1,
 title = "Privatizing Social Security",
 author = "Martin Feldstein",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1998",
 URL = "http://www.nber.org/books/feld98-1",
}