3 IZA Discussion Papers
IZA Discussion Paper No. 1354
published in: Journal of Population Economics, 2007, 20 (1), 121-148
IZA Discussion Paper No. 296
published in: Journal of Population Economics, 2003, 16 (4), 755-786
IZA Discussion Paper No. 291
published in: Journal of Population Economics, 2003, 16 (4), 711-737