
https://static1.squarespace.com/static/5afc0bbbf79392ced8b73dbf/t/5b07d7ce1ae6cf2a4178f587/1527240672975/SGC_Full_Report.pdf

https://futuros.gob.es/sites/default/files/2023-09/RESILIENTEU2030.pdf

https://www.nber.org/system/files/working_papers/w32002/w32002.pdf