@inbook{NBERc10308,
 Crossref = "NBERogura03-1",
 title = "Option Value Estimation with Health and Retirement Study Data",
 author = "Andrew Samwick and David A. Wise",
 BookTitle = "Labor Markets and Firm Benefit Policies in Japan and the United States",
 Publisher = "University of Chicago Press",
 pages = "205-228",
 year = "2003",
 month = "January",
 URL = "http://www.nber.org/chapters/c10308",
}
@book{NBERogura03-1,
 title = "Labor Markets and Firm Benefit Policies in Japan and the United States",
 author = "Seiritsu Ogura and Toshiaki Tachibanaki and David A. Wise",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2003",
 URL = "http://www.nber.org/books/ogura03-1",
}