@inbook{NBERc3287,
 Crossref = "NBERcole70-1",
 title = "Characteristics of the Revisions",
 author = "Rosanne Cole",
 BookTitle = "Errors in Provisional Estimates of Gross National Product",
 Publisher = "NBER",
 pages = "16-27",
 year = "1970",
 URL = "http://www.nber.org/chapters/c3287",
}
@book{NBERcole70-1,
 title = "Errors in Provisional Estimates of Gross National Product",
 author = "Rosanne Cole",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1970",
 URL = "http://www.nber.org/books/cole70-1",
}