@inbook{NBERc2687,
 Crossref = "NBERunkn57-2",
 title = "The Scope of Economic Activity in International Income Comparisons",
 author = "Irving Kravis",
 BookTitle = "Problems in the International Comparison of Economic Accounts",
 Publisher = "UMI",
 pages = "349-400",
 year = "1957",
 URL = "http://www.nber.org/chapters/c2687",
}
@book{NBERunkn57-2,
 title = "Problems in the International Comparison of Economic Accounts",
 author = "",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "UMI",
 year = "1957",
 URL = "http://www.nber.org/books/unkn57-2",
}