3 IZA Discussion Papers
IZA Discussion Paper No. 13645
published in: Journal of Applied Economics, 2022, 25 (1), 220 - 241
IZA Discussion Paper No. 8125
published in: Labour Economics, 2014, 30, 4-11
IZA Discussion Paper No. 225
published in: Labour Economics, 2001, 8 (4), 475-501