3 IZA Discussion Papers
IZA Discussion Paper No. 8326
published in Journal of the Asia Pacific Economy, 2015, 20, 594–612
IZA Discussion Paper No. 5711
resvised version published in: Industrial and Labor Relations Review, 2015, 68(2), 398-425
IZA Discussion Paper No. 2477
published in: Journal of Public Economics, 2007, 91 (5-6), 1197-1218