@inbook{NBERc7195,
 Crossref = "NBERstoc93-1",
 title = "A Dynamic Index Model for Large Cross Sections",
 author = "Danny Quah and Thomas J. Sargent",
 BookTitle = "Business Cycles, Indicators and Forecasting",
 Publisher = "University of Chicago Press",
 pages = "285-310",
 year = "1993",
 month = "January",
 URL = "http://www.nber.org/chapters/c7195",
}
@book{NBERstoc93-1,
 title = "Business Cycles, Indicators and Forecasting",
 author = "James H. Stock and Mark W. Watson",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1993",
 URL = "http://www.nber.org/books/stoc93-1",
}