4 IZA Discussion Papers
IZA Discussion Paper No. 10706
IZA Discussion Paper No. 10061
published in: Quantitative Economics, Vol. 9(2), July 2018, Pages 735-784.
IZA Discussion Paper No. 6835
IZA Discussion Paper No. 3324
published in: German Economic Review, 2010, 11 (1), 37 - 59