@inbook{NBERc11581,
 Crossref = "NBERwise89-1",
 title = "How Much Care Do the Aged Receive from Their Children? A Bimodal Picture of Contact and Assistance",
 author = "Laurence J. Kotlikoff and John N. Morris",
 BookTitle = "The Economics of Aging",
 Publisher = "University of Chicago Press",
 pages = "151-176",
 year = "1989",
 URL = "http://www.nber.org/chapters/c11581",
}
@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",
}