3 IZA Discussion Papers
IZA Discussion Paper No. 6544
published in: Empirical Economics, 2015, 49, 1123-1141
IZA Discussion Paper No. 3128
published in: German Economic Review, 2010, 11(3), 278-301
IZA Discussion Paper No. 2888
published in: Empirical Economics, 2013, 44, 661-683