3 IZA Discussion Papers
IZA Discussion Paper No. 5616
revised version published in: Oxford Bulletin of Economics and Statistics, 2015, 77(2), 191–209
IZA Discussion Paper No. 3872
revised version published in: Journal of the Royal Statistical Society, Series A (Statistics in Society), 2012, 175 (1), 167-190
IZA Discussion Paper No. 3057
published in: Journal of Social Policy, 2009, 38(2), 317-341