3 IZA Discussion Papers
IZA Discussion Paper No. 9699
substantially revised version published in: Economics of Education Review, 2017, 56, 80-94
IZA Discussion Paper No. 8983
published in: Education Economics, 2018, 26 (3), 321-336
IZA Discussion Paper No. 8596
published in: Journal of Human Capital, 2016, 10 (4), 482–519