@inbook{NBERc5970,
 Crossref = "NBERbern91-1",
 title = "Introduction to "Fifty Years of Economic Measurement: The Jubilee of the Conference on Research in Income and Wealth"",
 author = "Ernst R. Berndt and Jack E. Triplett",
 BookTitle = "Fifty Years of Economic Measurement: The Jubilee of the Conference on Research in Income and Wealth",
 Publisher = "University of Chicago Press",
 pages = "1-2",
 year = "1991",
 month = "January",
 URL = "http://www.nber.org/chapters/c5970",
}
@book{NBERbern91-1,
 title = "Fifty Years of Economic Measurement: The Jubilee of the Conference on Research in Income and Wealth",
 author = "Ernst R. Berndt and Jack E. Triplett",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1990",
 URL = "http://www.nber.org/books/bern91-1",
}