6 IZA Discussion Papers
IZA Discussion Paper No. 8125
published in: Labour Economics, 2014, 30, 4-11
IZA Discussion Paper No. 4063
IZA Discussion Paper No. 3876
IZA Discussion Paper No. 3413
IZA Discussion Paper No. 2733
published in: European Economic Review, 2010, 54 (3), 376-392
IZA Discussion Paper No. 2628
published in: Labour Economics, 2009, 16 (3), 284-290