4 IZA Discussion Papers
IZA Discussion Paper No. 9244
IZA Discussion Paper No. 7069
substantially revised version published in: American Economic Review, 2014, 104 (2), 707-719
IZA Discussion Paper No. 5239
published in: Journal of Monetary Economics, 2013, 60 (3), 367–382
IZA Discussion Paper No. 1876
published in: International Journal of Manpower, 2007, 28 (1), 75-94