4 IZA Discussion Papers
IZA Discussion Paper No. 3033
published in: Macroeconomic Dynamics, 2009, 13 (1), 81-106
IZA Discussion Paper No. 2600
IZA Discussion Paper No. 636
published in: European Journal of Political Economy, 2005, 21 (1), 1-32
IZA Discussion Paper No. 635