
https://www.greatbritishpolitics.co.uk/europe/654-dual-nationality-and-the-hurdles-facing-britons-who-want-to-keep-eu-citizenship-after-brexit.html

https://www.bancaditalia.it/media/approfondimenti/2019/pop-bari/approfondimenti-popBari.pdf

https://www.strategie.gouv.fr/sites/strategie.gouv.fr/files/atoms/files/avis_du_comite_fiscalite_capital-01-10-2019.pdf