3 IZA Discussion Papers
IZA Discussion Paper No. 8528
published in: China Economic Review, 2015, 35, 47-69
IZA Discussion Paper No. 5530
published in: European Economic Review, 2013, 64, 369-383
IZA Discussion Paper No. 5404
extended version published in: American Economic Review, 2013, 103 (1), 510-531