3 IZA Discussion Papers
IZA Discussion Paper No. 1241
published in: Journal of Population Economics, 2011, 24 (1), 107-139
IZA Discussion Paper No. 933
published in: Journal of the European Economic Association, 2004, 2 (2/3), 346-360
IZA Discussion Paper No. 205
published in: Economic Journal, 2002, 112 (480), F585-606