63 IZA Discussion Papers
IZA Discussion Paper No. 1028
published in: El Trimestre Economico, 2010, 302 (2)
IZA Discussion Paper No. 1018
published in: World Development, 2005, 33 (11), 1905-1921
IZA Discussion Paper No. 981
published in: Review of Economics and Statistics, 2008, 90 (2), 290-299