5 IZA Discussion Papers
IZA Discussion Paper No. 11011
published in: Industrial and Labor Relations Review, 2019, 72 (1), 127-157
IZA Discussion Paper No. 7882
IZA Discussion Paper No. 5511
IZA Discussion Paper No. 2754
published in: Journal of the European Economic Association, 2011, 9 (2), 278-318
IZA Discussion Paper No. 1960
revised version published in: Economic Journal, 2007, 117 (521), F302 - F332