24 IZA Discussion Papers
IZA Discussion Paper No. 640
published in: Applied Economics, 2006, 38, (9), 1019-1035
IZA Discussion Paper No. 310
substantially revised version published as 'Human Capital Formation, Education and Earnings Inequality' in: Applied Economics Quarterly, 2008, 54(1), 7 - 26
IZA Discussion Paper No. 180
published in: Labour, 2001, 15 (2), 237-255
IZA Discussion Paper No. 156
published in: Economic Journal, 2003, 113 (489), 695-717
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