3 IZA Discussion Papers
IZA Discussion Paper No. 9119
published in: Economic Journal, 2019, 129 (618), 553-602
IZA Discussion Paper No. 8983
published in: Education Economics, 2018, 26 (3), 321-336
IZA Discussion Paper No. 4738
published in: Journal of Econometrics, 2012, 166 (1), 3-16