2 IZA Discussion Papers
IZA Discussion Paper No. 3950
published in: International Journal of Manpower, 2009, 30 (1+2), 26-42
IZA Discussion Paper No. 3564
published in: Jagdish Bhagwati and Gordon H. Hanson (eds.), Skilled Migration Today: Phenomenon, Prospects, Problems, Policies. New York: Oxford, 2009