3 IZA Discussion Papers
IZA Discussion Paper No. 2958
published in: World Development, 2009, 37 (2), 287-302
IZA Discussion Paper No. 2562
published in: International Journal of Manpower, 2009, 30 (8), 835-852
IZA Discussion Paper No. 1982
published in: Cambridge Journal of Economics, 2007, 31(5), 691-710