@inbook{NBERc3616,
 Crossref = "NBERmoss73-1",
 title = "An Imputation to the Measure of Economic Growth for Changes in Life Expectancy",
 author = "Dan Usher",
 BookTitle = "The Measurement of Economic and Social Performance",
 Publisher = "NBER",
 pages = "193-232",
 year = "1973",
 URL = "http://www.nber.org/chapters/c3616",
}
@book{NBERmoss73-1,
 title = "The Measurement of Economic and Social Performance",
 author = "Milton Moss",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1973",
 URL = "http://www.nber.org/books/moss73-1",
}