@inbook{NBERc9361,
 Crossref = "NBERmaca31-1",
 title = "The Smoothing of Economic Time Series, Curve Fitting and Graduation",
 author = "Frederick R. Macaulay",
 BookTitle = "The Smoothing of Time Series",
 Publisher = "NBER",
 pages = "31-42",
 year = "1931",
 URL = "http://www.nber.org/chapters/c9361",
}
@book{NBERmaca31-1,
 title = "The Smoothing of Time Series",
 author = "Frederick R. Macaulay",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1931",
 URL = "http://www.nber.org/books/maca31-1",
}