@inbook{NBERc12633,
 Crossref = "NBERales11-1",
 title = "Comment on "Government Spending and Private Activity"",
 author = "Roberto Perotti",
 BookTitle = "Fiscal Policy after the Financial Crisis",
 Publisher = "University of Chicago Press",
 pages = "56-61",
 year = "2012",
 month = "May",
 URL = "http://www.nber.org/chapters/c12633",
}
@book{NBERales11-1,
 title = "Fiscal Policy after the Financial Crisis",
 author = "Alberto Alesina and Francesco Giavazzi",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2013",
 URL = "http://www.nber.org/books/ales11-1",
}