25 IZA Discussion Papers
IZA Discussion Paper No. 1455
IZA Discussion Paper No. 1451
published in: Research on Economic Inequality, 2007 (14), 317-344
IZA Discussion Paper No. 1445
revised version published in: Labour Economics, 2006, 13 (6), 667-693
IZA Discussion Paper No. 1441
revised version published in: Journal of Population Economics, 2008, 21 (2), 339-371
IZA Discussion Paper No. 769
published in Journal of Human Resources, 2004, 39 (4), 1008-1032
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