6 IZA Discussion Papers
IZA Discussion Paper No. 17378
IZA Discussion Paper No. 13490
IZA Discussion Paper No. 5972
published in: International Journal of Social Economics, 2018, 45 (2), 286-299
IZA Discussion Paper No. 2835
revised version published in: Labour Economics, 2011, 18 (2), 168-179
IZA Discussion Paper No. 2331
IZA Discussion Paper No. 384
published in: Research in Labor Economics 22, 2003, 159-202