103 IZA Discussion Papers
IZA Discussion Paper No. 548
published in: Econometric Reviews, 2004, 23 (2), 167-174
IZA Discussion Paper No. 542
published in: Journal of Economic Surveys, 2004, 18 (2), 181-224
IZA Discussion Paper No. 323
published in: Research in Labor Economics, 2008, 28, 25-55
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