4 IZA Discussion Papers
IZA Discussion Paper No. 8161
published in: Journal of Economic Geography, 2016, 16 (5), 1007-1034
IZA Discussion Paper No. 1969
published in: Jahrbücher für Nationalökonomie und Statistik (Journal of Economics and Statistics), 2010, 230 (1), 92-114
IZA Discussion Paper No. 1723
published in: Labour Economics, 2006, 13 (4), 445-458
IZA Discussion Paper No. 1333
published in: Economics Bulletin, 2005, 17 (15), 1-8