4 IZA Discussion Papers
IZA Discussion Paper No. 8919
published in: Journal of Economics and Statistics (Jahrbücher für Nationalökonomie und Statistik), 2016, 236 (2), 157-180
IZA Discussion Paper No. 2494
published in: Journal of Economic Behavior and Organization, 2008, 68 (3-4), 433-444
IZA Discussion Paper No. 2066
short version published in: American Economic Review, 2006, 96 (2), 375-382
IZA Discussion Paper No. 1891
published in: Regional Studies, 2008, 42(4), 555-577