8 IZA Discussion Papers
IZA Discussion Paper No. 14911
IZA Discussion Paper No. 14785
IZA Discussion Paper No. 14572
IZA Discussion Paper No. 14077
IZA Discussion Paper No. 14007
IZA Discussion Paper No. 11977
published: American Economic Review: Insights, 2020, 2 (4), 409 - 424
IZA Discussion Paper No. 9370
IZA Discussion Paper No. 6358
revised version published in: The Manchester School, 2014, 82 (3), 363-384