@inbook{NBERc8191,
 Crossref = "NBERwise08-1",
 title = "Comment on "Work Disability: The Effects of Demography, Health, and Disability Insurance"",
 author = "Robert J. Willis",
 BookTitle = "Research Findings in the Economics of Aging",
 Publisher = "University of Chicago Press",
 pages = "58-61",
 year = "2010",
 month = "February",
 URL = "http://www.nber.org/chapters/c8191",
}
@book{NBERwise08-1,
 title = "Research Findings in the Economics of Aging",
 author = "David A. Wise",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2010",
 URL = "http://www.nber.org/books/wise08-1",
}