3 IZA Discussion Papers
IZA Discussion Paper No. 10785
published in: Education Economics, 2017, 25 (6), 619 - 639
IZA Discussion Paper No. 9332
revised version published in: Applied Economics, 2017, 49 (14), 1440-1457
IZA Discussion Paper No. 4212
revised version published in: Journal of Population Economics, 2013, 26 (2), 619-644