4 IZA Discussion Papers
IZA Discussion Paper No. 14062
IZA Discussion Paper No. 13011
IZA Discussion Paper No. 12626
published in: Economics Bulletin, 2018, 38 (2), 1124-1137.
IZA Discussion Paper No. 10407
revised version published in: Journal of Economic Behavior & Organization, 2020, 177, 548-568