463 IZA Discussion Papers
IZA Discussion Paper No. 216
published in: Economics of Education Review, 2002, 21(3), 263-276
IZA Discussion Paper No. 51
published in: Industrial and Labor Relations Review, 2001, 54 (3), 647-662
IZA Discussion Paper No. 40
published in: Klaus F. Zimmermann (ed.): European Migration - What Do We Know?, Oxford University Press, Oxford, 2005