524 IZA Discussion Papers
IZA Discussion Paper No. 368
published in: Quarterly Journal of Economics, 2002, 117 (3), 997-1038
IZA Discussion Paper No. 237
published in: Journal of African Economies, 2009, 18 (1), 1-51
IZA Discussion Paper No. 231
IZA Discussion Paper No. 191
published in: Journal of Population Economics, 2003, 16 (2), 265-285