@inbook{NBERc10226,
 Crossref = "NBERaesm75-1",
 title = "Announcements",
 author = "NBER",
 BookTitle = "Annals of Economic and Social Measurement, Volume 4, number 1",
 Publisher = "NBER",
 pages = "205-206",
 year = "1975",
 URL = "http://www.nber.org/chapters/c10226",
}
@book{NBERaesm75-1,
 title = "Annals of Economic and Social Measurement, Volume 4, number 1",
 author = "Sanford V. Berg, editor",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1975",
 URL = "http://www.nber.org/books/aesm75-1",
}