3 IZA Discussion Papers
IZA Discussion Paper No. 12429
published in: American Economic Journal: Economic Policy, 2022, 14 (1), 40–80
IZA Discussion Paper No. 4345
published in: Economics of Education Review, 2010, 29 (6), 947-958
IZA Discussion Paper No. 3216
published in: Review of Economics and Statistics, 2010, 92 (2), 244-262