3 IZA Discussion Papers
IZA Discussion Paper No. 7014
published in: Economic Journal, 2017, 127 (605), F1-F23
IZA Discussion Paper No. 3057
published in: Journal of Social Policy, 2009, 38(2), 317-341
IZA Discussion Paper No. 1711
published in: Review of Development Economics, 2006, 10 (2), 285-296