54 IZA Discussion Papers
IZA Discussion Paper No. 487
published in: Economic Journal, 2003, 113 (484), 101-127
IZA Discussion Paper No. 414
published in: Labour Economics, 2007, 14 (5), 811-828
IZA Discussion Paper No. 370
published in: Oxford Bulletin of Economics and Statistics, 2004, 66 (2), 205-237
IZA Discussion Paper No. 369
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