44 IZA Discussion Papers
IZA Discussion Paper No. 1043
published in: European Journal of Political Economy, 2005, 21 (3), 598-642
IZA Discussion Paper No. 958
published in: Applied Economics, 2006, 38 (8), 899-911
IZA Discussion Paper No. 514
IZA Discussion Paper No. 26
published in: Journal of Economic Literature, 2000, 38 (1), 77-114