@inbook{NBERc12413,
 Crossref = "NBERacem11-1",
 title = "Comment on "Risk Topography"",
 author = "Darrell Duffie",
 BookTitle = "NBER Macroeconomics Annual 2011, Volume 26",
 Publisher = "University of Chicago Press",
 pages = "177-183",
 year = "2011",
 month = "June",
 URL = "http://www.nber.org/chapters/c12413",
}
@book{NBERacem11-1,
 title = "NBER Macroeconomics Annual 2011, Volume 26",
 author = "Daron Acemoglu and Michael Woodford",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2012",
 URL = "http://www.nber.org/books/acem11-1",
}