@inbook{NBERc12501,
 Crossref = "NBERfran11-1",
 title = "Firm Heterogeneity, Endogenous Entry, and the Business Cycle",
 author = "Gianmarco I. P. Ottaviano",
 BookTitle = "NBER International Seminar on Macroeconomics 2011",
 Publisher = "University of Chicago Press",
 pages = "57-86",
 year = "2011",
 month = "August",
 URL = "http://www.nber.org/chapters/c12501",
}
@book{NBERfran11-1,
 title = "NBER International Seminar on Macroeconomics 2011",
 author = "Jeffrey Frankel and Christopher Pissarides",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2012",
 URL = "http://www.nber.org/books/fran11-1",
}