6 IZA Discussion Papers
IZA Discussion Paper No. 17032
IZA Discussion Paper No. 16591
IZA Discussion Paper No. 16453
IZA Discussion Paper No. 11909
IZA Discussion Paper No. 6927
revised version published in: Journal of Economic Behavior and Organization, 2014, 107 (A), 86-106
IZA Discussion Paper No. 4884
published in: Journal of Political Economy, 2010, 118 (4), 723-746