@inbook{NBERc10594,
 Crossref = "NBERcamp01-1",
 title = "The Social Security Trust Fund, the Riskless Interest Rate, and Capital Accumulation",
 author = "Andrew B. Abel",
 BookTitle = "Risk Aspects of Investment-Based Social Security Reform",
 Publisher = "University of Chicago Press",
 pages = "153-202",
 year = "2001",
 month = "January",
 URL = "http://www.nber.org/chapters/c10594",
}
@book{NBERcamp01-1,
 title = "Risk Aspects of Investment-Based Social Security Reform",
 author = "John Y. Campbell and Martin Feldstein",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2001",
 URL = "http://www.nber.org/books/camp01-1",
}