6 IZA Discussion Papers
IZA Discussion Paper No. 13238
IZA Discussion Paper No. 12767
IZA Discussion Paper No. 11616
IZA Discussion Paper No. 4487
IZA Discussion Paper No. 4352
published in: Schmollers Jahrbuch: Zeitschrift für Wirtschafts- und Sozialwissenschaften /Journal of Applied Social Science Studies, 2011, 131 (1), 91-106
IZA Discussion Paper No. 1442
published in: British Journal of Industrial Relations, 2005, 43 (2), 233-248