6 IZA Discussion Papers
IZA Discussion Paper No. 12196
IZA Discussion Paper No. 9139
IZA Discussion Paper No. 6170
revised version published in: Fiscal Studies, 2013, 34 (3), 355-371
IZA Discussion Paper No. 5926
revised version published in: Applied Economics, 2013, 45 (32), 4591-4601
IZA Discussion Paper No. 4922
IZA Discussion Paper No. 4825
substantially revised version available as: IZA DP 5926