103 IZA Discussion Papers
IZA Discussion Paper No. 231
published as 'Economic aspects of human cloning and reprogenetics' in: Economic Policy, 2003, 18 (36), 72 - 122
IZA Discussion Paper No. 40
published in: Klaus F. Zimmermann (ed.): European Migration - What Do We Know?, Oxford University Press, Oxford, 2005
IZA Discussion Paper No. 29