83 IZA Discussion Papers
IZA Discussion Paper No. 1799
published in: Review of Economic and Statistics, 2006, 88(3), 472-481
IZA Discussion Paper No. 1617
published in: Journal of Public Economics, 2013, 97, 131-143
IZA Discussion Paper No. 600
published in: Comparative Economic Studies, 2007, 49 (1), 128-155