3 IZA Discussion Papers
IZA Discussion Paper No. 4753
IZA Discussion Paper No. 4692
published in: Oxford Development Studies, 2012, 40 (3), 381-404
IZA Discussion Paper No. 4365
published in: Review of Economic Studies, 2014, 81 (2), 787-817 (Note: Article has been retracted by the authors because the original findings cannot be replicated, likely as a result of an inadvertent coding error)