3 IZA Discussion Papers
IZA Discussion Paper No. 8069
revised version published in: British Journal of Industrial Relations, 2017, 55 (1), 58-82
IZA Discussion Paper No. 792
published in: Journal of Economic Behavior and Organization, 2004, 54 (2), 137-151
IZA Discussion Paper No. 751
published in: Labour Economics, 2004, 11 (1), 85-98