3 IZA Discussion Papers
IZA Discussion Paper No. 3697
published in: The B.E. Journal of Macroeconomics: Contributions to Macroeconomics, 2010, 10 (1), Article 31
IZA Discussion Paper No. 2056
published in: Labour Economics, 2009, 16 (3), 311-319
IZA Discussion Paper No. 1260