23 IZA Discussion Papers
IZA Discussion Paper No. 5894
published in: International Review of Applied Economics, 2012, 26 (4), 489 - 513
IZA Discussion Paper No. 5765
Published in: Journal of Public Economics, 2014, 115, 94-108
IZA Discussion Paper No. 1533
published in: Journal of Population Economics, 2006, 19 (4), 703-723
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