4 IZA Discussion Papers
IZA Discussion Paper No. 14817
IZA Discussion Paper No. 9693
IZA Discussion Paper No. 3191
published in: American Economic Journal: Macroeconomics, 2010, 2 (1), 93-130
IZA Discussion Paper No. 1052
published in: European Economic Review, 2007, 51 (8), 1941-1958