6 IZA Discussion Papers
IZA Discussion Paper No. 14228
IZA Discussion Paper No. 14095
IZA Discussion Paper No. 13927
IZA Discussion Paper No. 13695
IZA Discussion Paper No. 13427
IZA Discussion Paper No. 13293
published in: Nature Journal: Scientific Reports (appeared also in CEPR's: "Covid Economics: Vetted and Real Time Papers", 2020, 23)