@inbook{NBERc10435,
 Crossref = "NBERaesm76-1",
 title = "NBER Computer Research Center Notes",
 author = "",
 BookTitle = "Annals of Economic and Social Measurement, Volume 5, number 1",
 Publisher = "NBER",
 pages = "163-164",
 year = "1976",
 URL = "http://www.nber.org/chapters/c10435",
}
@book{NBERaesm76-1,
 title = "Annals of Economic and Social Measurement, Volume 5, number 1",
 author = "Sanford V. Berg, editor",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1976",
 URL = "http://www.nber.org/books/aesm76-1",
}