184 IZA Discussion Papers
IZA Discussion Paper No. 93
published in: Journal of Human Resources, 2000, 35 (2), 347-375
IZA Discussion Paper No. 83
published in: Economic Journal, 2001, 111 (471), C120-C134
IZA Discussion Paper No. 75
published in: Oxford Economic Papers, 52 (2000), 178-203
IZA Discussion Paper No. 9