64 IZA Discussion Papers
IZA Discussion Paper No. 2348
published in: Economic Policy, 52, 2007, 781-861
IZA Discussion Paper No. 1005
published in: Journal of Public Economics, 2008, 92 (5-6), 1441-1462
IZA Discussion Paper No. 545
IZA Discussion Paper No. 450
published in: Economic Record, 2003, 79 (245), 165-181