6 IZA Discussion Papers
IZA Discussion Paper No. 14256
IZA Discussion Paper No. 13426
IZA Discussion Paper No. 11088
IZA Discussion Paper No. 8310
IZA Discussion Paper No. 7322
published in: Review of Economic Studies, 2013, 80 (2), 429-462
IZA Discussion Paper No. 3416
published in: Journal of the European Economic Association, 2008, 6 (2-3), 321-352