6 IZA Discussion Papers
IZA Discussion Paper No. 14860
IZA Discussion Paper No. 14546
IZA Discussion Paper No. 14546
IZA Discussion Paper No. 13876
Published in: BMC Health Services Research 20, 1008 (2020).
IZA Discussion Paper No. 11352
IZA Discussion Paper No. 10018
published in: World Development, 2018, 102, 1-17