363 IZA Discussion Papers
IZA Discussion Paper No. 93
published in: Journal of Human Resources, 2000, 35 (2), 347-375
IZA Discussion Paper No. 51
published in: Industrial and Labor Relations Review, 2001, 54 (3), 647-662
IZA Discussion Paper No. 51
published in: Industrial and Labor Relations Review, 2001, 54 (3), 647-662