3 IZA Discussion Papers
IZA Discussion Paper No. 9406
revised and shortened version published in: European Journal of Political Economy, 2019, 59, 331-344
IZA Discussion Paper No. 5500
published in: E.A. Hanushek, S. Machin and S. Woessman (eds). Handbook of the Economics of Education, Amsterdam: Elsevier. 2011
IZA Discussion Paper No. 3762
revised version published as 'Integration, Social Networks and Economic Success of Immigrants' in: Kyklos, 2011, 64 (3), 342-365