@inbook{NBERc11583,
 Crossref = "NBERwise89-1",
 title = "The Poverty of Widows: Future Prospects",
 author = "Michael D. Hurd",
 BookTitle = "The Economics of Aging",
 Publisher = "University of Chicago Press",
 pages = "201-230",
 year = "1989",
 URL = "http://www.nber.org/chapters/c11583",
}
@book{NBERwise89-1,
 title = "The Economics of Aging",
 author = "David A. Wise",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1989",
 URL = "http://www.nber.org/books/wise89-1",
}