44 IZA Discussion Papers
IZA Discussion Paper No. 3610
published in: Economics and Human Biology, 2010, 7 (2), 246-262
IZA Discussion Paper No. 3335
published in: Applied Economics, 2012, 44 (3), 289 - 302
IZA Discussion Paper No. 2841
IZA Discussion Paper No. 1673
published in: Labour Economics, 2008, 15(5), 958-983