5 IZA Discussion Papers
IZA Discussion Paper No. 10762
IZA Discussion Paper No. 7603
IZA Discussion Paper No. 4197
substantially revised version available as IZA Standpunkt No. 18, published in: Zeitschrift für ArbeitsmarktForschung / Journal for Labour Market Research, 2011, 43(4), 327-338
IZA Discussion Paper No. 1891
published in: Regional Studies, 2008, 42(4), 555-577
IZA Discussion Paper No. 1049
published in: Sociological Methods and Research, 2006, 34 (4), 427-468