@inbook{NBERc7119,
 Crossref = "NBERwise90-1",
 title = "The Joint Retirement Decision of Husbands and Wives",
 author = "Michael D. Hurd",
 BookTitle = "Issues in the Economics of Aging",
 Publisher = "University of Chicago Press, 1990",
 pages = "231-258",
 year = "1990",
 month = "January",
 URL = "http://www.nber.org/chapters/c7119",
}
@book{NBERwise90-1,
 title = "Issues in the Economics of Aging",
 author = "David A. Wise",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press, 1990",
 year = "1990",
 URL = "http://www.nber.org/books/wise90-1",
}