5 IZA Discussion Papers
IZA Discussion Paper No. 16042
IZA Discussion Paper No. 10038
published in: Applied Economics, 2017, 49, 1345-1350
IZA Discussion Paper No. 1879
published in: Journal of Institutional and Theoretical Economics, 2007, 163 (2), 313-335
IZA Discussion Paper No. 1402
revised version published in: Industrial and Labor Relations Review, 2008, 61 (4), 485-501
IZA Discussion Paper No. 387
completely revised version published as IZA DP No. 1879