5 IZA Discussion Papers
IZA Discussion Paper No. 15699
IZA Discussion Paper No. 15296
IZA Discussion Paper No. 7219
IZA Discussion Paper No. 2559
published in: International Tax and Public Finance, 2009, 16 (5), 697-709
IZA Discussion Paper No. 2547
published in: in: Heise, Michael, Tilly, Richard, Welfens, Paul J.J. (eds.), Integration, Financial Markets and Innovations – 50 Years of EU Dynamics, 2007, 75-108.