3 IZA Discussion Papers
IZA Discussion Paper No. 5942
published in: IZA Journal of European Labor Studies, 2013, 2:2
IZA Discussion Paper No. 5660
published in: Journal of Public Economics, 2011, 95 (11-12), 1635-1651
IZA Discussion Paper No. 4523
published in: De Economist, 2012, 160 (4), 413-438