4 IZA Discussion Papers
IZA Discussion Paper No. 17176
IZA Discussion Paper No. 9418
published in: IZA Journal of European Labor Studies, 2015, 4:23
IZA Discussion Paper No. 8683
published in: CESifo Economic Studies, 2015, 61 (3-4), 638-672
IZA Discussion Paper No. 5765
Published in: Journal of Public Economics, 2014, 115, 94-108