@inbook{NBERc3908,
 Crossref = "NBERzell79-1",
 title = "Some Consequences of Temporal Aggregation in Seasonal Time Series Models",
 author = "William W. S. Wei",
 BookTitle = "Seasonal Analysis of Economic Time Series",
 Publisher = "NBER",
 pages = "433-448",
 year = "1979",
 URL = "http://www.nber.org/chapters/c3908",
}
@book{NBERzell79-1,
 title = "Seasonal Analysis of Economic Time Series",
 author = "Arnold Zellner",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1979",
 URL = "http://www.nber.org/books/zell79-1",
}