4 IZA Discussion Papers
IZA Discussion Paper No. 12172
published in: Journal of Human Resources, 2021, 56 (3), 655-685
IZA Discussion Paper No. 9593
published in: Journal of Economic Literature, 2018, 56, 111 - 156
IZA Discussion Paper No. 6780
published in: Scientometrics, 2013, 95 (3), 1095-1112
IZA Discussion Paper No. 4785
published in: Kyklos, 2010, 63 (4), 479-494; cited in The Economist, February 2011