3 IZA Discussion Papers
IZA Discussion Paper No. 5131
published in: American Economic Journal: Macroeconomics, 2012, 5 (1), 193-221
IZA Discussion Paper No. 2252
published in: Journal of International Economics, 2006, 69 (1), 176-202
IZA Discussion Paper No. 1903
published in: Journal of Population Economics, 2008, 21 (3), 679-684