3 IZA Discussion Papers
IZA Discussion Paper No. 13912
IZA Discussion Paper No. 13293
published in: Nature Journal: Scientific Reports , 2021, 11, 1972, (appeared also in CEPR's: Covid Economics: Vetted and Real Time Papers, 2020, 23)
IZA Discussion Paper No. 13165
published in: Journal of Population Economics, 2020, 33, 1127 - 1172