@inbook{NBERc0998,
 Crossref = "NBERpopk77-1",
 title = "The Impact on Econometric Models of the Present Treatment of Smog and Safety Devices in Economic Statistics: A Comment",
 author = "Jack E. Triplett",
 BookTitle = "Analysis of Inflation: 1965-1974",
 Publisher = "NBER",
 pages = "403-408",
 year = "1977",
 URL = "http://www.nber.org/chapters/c0998",
}
@book{NBERpopk77-1,
 title = "Analysis of Inflation: 1965-1974",
 author = "Joel Popkin",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1977",
 URL = "http://www.nber.org/books/popk77-1",
}