2 IZA Discussion Papers
IZA Discussion Paper No. 5964
published as 'The Employment of Low-Skilled Immigrant Men in the United States' in: American Economic Review, 2012, 102 (3), 549-554
IZA Discussion Paper No. 7
published in: Boesler, Klaus-Achim/ Heinritz, Günter/ Wiessner, Reinhard (Hrsg.), Europa zwischen Integration und Regionalismus, Franz Steiner Verlag, Stuttgart, 1998, 56-66