5 IZA Discussion Papers
IZA Discussion Paper No. 17062
IZA Discussion Paper No. 11252
IZA Discussion Paper No. 8453
also available as: CEPS Working Document No. 399, Centre for European Policy Studies, Brussels, September
IZA Discussion Paper No. 5638
published in: Journal of Business & Economic Studies, 2013, 31 (3), 300 - 314
IZA Discussion Paper No. 5042
published in: Mathematical Population Studies, 2012, 19 (1), 51-62