4 IZA Discussion Papers
IZA Discussion Paper No. 13692
IZA Discussion Paper No. 13057
forthcoming in: The Stata Journal
IZA Discussion Paper No. 12811
revised version forthcoming in: Review of Income and Wealth
IZA Discussion Paper No. 12810
published in: New Zealand Economic Papers, online ahead of print, https://www.tandfonline.com/doi/full/10.1080/00779954.2019.1697729 (Open Access)