5 IZA Discussion Papers
IZA Discussion Paper No. 15441
IZA Discussion Paper No. 10700
IZA Discussion Paper No. 10403
published in: American Economic Review: Papers & Proceedings 2017, 107(5): 37–40
IZA Discussion Paper No. 2724
published in: Journal of Public Economics, 2008, 92 (8-9), 1833-1845
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