3 IZA Discussion Papers
IZA Discussion Paper No. 7490
revised version published in: IZA Journal of European Labor Studies, 2013, 2:18
IZA Discussion Paper No. 7260
substantially revised version published in: IMF Economic Review, 2013, 61 (4), 702-729
IZA Discussion Paper No. 6119
published in: European Migration and Asylum Policies: Coherence or Contradiction, C. Gortázar, C. Parra, B. Segaert, and C. Timmerman, editors. Bruylant: Belgium, 2012, 49-77