@inbook{NBERc8249,
 Crossref = "NBERfran08-1",
 title = "Comment on "Regional difference-in-differences in France using the German annexation of Alsace-Moselle in 1870-1918"",
 author = "Christopher Pissarides",
 BookTitle = "NBER International Seminar on Macroeconomics 2008",
 Publisher = "University of Chicago Press",
 pages = "310-314",
 year = "2009",
 month = "April",
 URL = "http://www.nber.org/chapters/c8249",
}
@book{NBERfran08-1,
 title = "NBER International Seminar on Macroeconomics 2008",
 author = "Jeffrey Frankel and Christopher Pissarides",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2009",
 URL = "http://www.nber.org/books/fran08-1",
}