6 IZA Discussion Papers
IZA Discussion Paper No. 14938
IZA Discussion Paper No. 13769
IZA Discussion Paper No. 12066
IZA Discussion Paper No. 9899
IZA Discussion Paper No. 8698
published in: Journal of Economic Behavior and Organization, 2017, 142, 509-539
IZA Discussion Paper No. 7484
publiished in: Economic Inquiry, 2014, 52(3), 974-993.