63 IZA Discussion Papers
IZA Discussion Paper No. 1642
revised version published in: Economic Development and Cultural Change, 2012, 60 (2), 311-357
IZA Discussion Paper No. 1004
published in: Journal of Public Economics, 2008, 92 (10-11), 1926-1941
IZA Discussion Paper No. 862
published in: Journal of Labor Research, 2004, 25 (4), 563-597