https://www.nber.org/system/files/working_papers/w27488/w27488.pdf
https://www.global-counsel.co.uk/sites/default/files/analysis/insight/download/Hard%20and%20Soft%20Political%20Risk.pdf
https://www.bancaditalia.it/compiti/riserve-portafoglio-rischi/cis/Presentazione_CIS_5.07.2021.pdf?language_id=1
https://institute.global/news/brexit-what-we-now-know