@inbook{NBERc10983,
 Crossref = "NBERblan91-1",
 title = "Pitfalls and Opportunities: What Macroeconomists Should Know About Unit Roots",
 author = "John Y. Campbell and Pierre Perron",
 BookTitle = "NBER Macroeconomics Annual 1991, Volume 6",
 Publisher = "MIT Press",
 pages = "141-220",
 year = "1991",
 month = "January",
 URL = "http://www.nber.org/chapters/c10983",
}
@book{NBERblan91-1,
 title = "NBER Macroeconomics Annual 1991, Volume 6",
 author = "Olivier Jean Blanchard and Stanley Fischer",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "MIT Press",
 year = "1991",
 URL = "http://www.nber.org/books/blan91-1",
}