3 IZA Discussion Papers
IZA Discussion Paper No. 5065
published in: Labour Economics, 2011, 18 (6), 755-766
IZA Discussion Paper No. 4682
published in: Contemporary Economic Policy, 2013, 31 (4), 649-668
IZA Discussion Paper No. 4453
published in: Regional Studies, 2012, 46 (10), 1389-1400