3 IZA Discussion Papers
IZA Discussion Paper No. 10608
published in : Journal of Economic Behavior and Organization, 2018, 149, 332 - 355
IZA Discussion Paper No. 9561
published in: American Economic Journal: Economic Policy, 2017, 9 (1), 180-209
IZA Discussion Paper No. 6646
published in: Journal of Public Economics, 2014, 120 , 32-47