44 IZA Discussion Papers
IZA Discussion Paper No. 916
published in: German Economic Review, 2006, 7(3), 249-264
IZA Discussion Paper No. 436
revised version published in: Labour Economics, 2005, 12 (1), 73-97
IZA Discussion Paper No. 425
published in: International Journal of Manpower, 2002, 23 (5), 394-410
IZA Discussion Paper No. 378