5 IZA Discussion Papers
IZA Discussion Paper No. 14779
IZA Discussion Paper No. 13218
revised & extended version published in: Journal of Economic Behavior and Organization, 2020, 180, 201-218
IZA Discussion Paper No. 9981
IZA Discussion Paper No. 7523
published in: Journal of Economic Behavior and Organization, 2015, 117, 223-232.
IZA Discussion Paper No. 5460