83 IZA Discussion Papers
IZA Discussion Paper No. 1608
published in: RWI-Mitteilungen, 2003/2004, 54/55 (3-4), 287-303
IZA Discussion Paper No. 1284
published in: Zeitschrift für Betriebswirtschaft, 2008, 78 (1), 45-70
IZA Discussion Paper No. 1273
published as "The earnings of informal carers: Wage differentials and opportunity costs" in: Journal of Health Economics, 2007, 26 (4), 821-841