@inbook{NBERc7193,
 Crossref = "NBERstoc93-1",
 title = "Why Does the Paper-Bill Spread Predict Real Economic Activity?",
 author = "Benjamin M. Friedman and Kenneth Kuttner",
 BookTitle = "Business Cycles, Indicators and Forecasting",
 Publisher = "University of Chicago Press",
 pages = "213-254",
 year = "1993",
 month = "January",
 URL = "http://www.nber.org/chapters/c7193",
}
@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",
}