https://www.sciencedirect.com/science/article/pii/S0022199617301411
https://www.brookings.edu/wp-content/uploads/2023/03/20230504_TPC_Gale_FiscalOutlookUPDATE.pdf
https://www.greatbritishpolitics.co.uk/europe/654-dual-nationality-and-the-hurdles-facing-britons-who-want-to-keep-eu-citizenship-after-brexit.html