3 IZA Discussion Papers
IZA Discussion Paper No. 9903
Journal of Economic Perspectives, May 2016, Vol. 30(2): 29-52
IZA Discussion Paper No. 5569
published in: Journal of Economic Behavior and Organization, 2012,. 84(2), 600-617.
IZA Discussion Paper No. 3381
published in: Oxford Economic Papers, 2009, 61 (3), 494-516