3 IZA Discussion Papers
IZA Discussion Paper No. 9939
IZA Discussion Paper No. 4773
published in: Review of Economics and Statistics, 2013, 95 (3), 1030-1045
IZA Discussion Paper No. 4090
published as 'Do German Welfare-to-Work Programmes Reduce Welfare Dependency and Increase Employment?' in: German Economic Review, 2011, 12 (2), 182-204