4 IZA Discussion Papers
IZA Discussion Paper No. 9622
published in: Empirical Economics, 2017, 52 (3), 1115-1142
IZA Discussion Paper No. 7808
revised version published in: Journal of Public Economics, 2015, 125, 1–15
IZA Discussion Paper No. 7493
published in: Review of Economics and Statistics, 2016, 98 (3), 535-551