105 IZA Discussion Papers
IZA Discussion Paper No. 1450
revised version published in: Economic Journal, 2008, 118(531), 1354-1384
IZA Discussion Paper No. 943
published in: Empirica, 2005, 32 (3-4), 345-368
IZA Discussion Paper No. 680
IZA Discussion Paper No. 628
published in: Economic Record, 2003, 79 (244), 84-102
IZA Discussion Paper No. 585
revised version published in: American Economic Review, 2005, 95 (5), 1653-1672