@inbook{NBERc10972,
 Crossref = "NBERblan90-1",
 title = "World Real Interest Rates",
 author = "Robert J. Barro and Xavier Sala-i-Martin",
 BookTitle = "NBER Macroeconomics Annual 1990, Volume 5",
 Publisher = "MIT Press",
 pages = "15-74",
 year = "1990",
 month = "January",
 URL = "http://www.nber.org/chapters/c10972",
}
@book{NBERblan90-1,
 title = "NBER Macroeconomics Annual 1990, Volume 5",
 author = "Olivier J. Blanchard and Stanley Fischer",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "MIT Press",
 year = "1990",
 URL = "http://www.nber.org/books/blan90-1",
}