5 IZA Discussion Papers
IZA Discussion Paper No. 17176
IZA Discussion Paper No. 14776
IZA Discussion Paper No. 14265
IZA Discussion Paper No. 8543
published in: Journal of the European Economic Association, 2019, 17 (5), 1502 - 1037
IZA Discussion Paper No. 5907
published in: Perspectives on Global Development and Technology, 2014, 13, 347-378.