207 IZA Discussion Papers
IZA Discussion Paper No. 157
published in: Labour Economics, 2001, 8 (6), 621-648
IZA Discussion Paper No. 134
published in: Journal of Labor Economics, 2004, 22(3), 553-584.
IZA Discussion Paper No. 127
IZA Discussion Paper No. 112
IZA Discussion Paper No. 75
published in: Oxford Economic Papers, 52 (2000), 178-203