@inbook{NBERc10332,
 Crossref = "NBERwise01-1",
 title = "Social Security Incentives for Retirement",
 author = "Courtney Coile and Jonathan Gruber",
 BookTitle = "Themes in the Economics of Aging",
 Publisher = "University of Chicago Press",
 pages = "311-354",
 year = "2001",
 month = "January",
 URL = "http://www.nber.org/chapters/c10332",
}
@book{NBERwise01-1,
 title = "Themes in the Economics of Aging",
 author = "David A. Wise",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2001",
 URL = "http://www.nber.org/books/wise01-1",
}