https://www.brookings.edu/wp-content/uploads/2022/09/Obstfeld-Zhou-Conference-Draft-BPEA-FA22.pdf
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.boeckler.de/pdf/p_imk_report_125e_2017.pdf
https://www.bruegel.org/sites/default/files/2023-06/PB%2012%202023.pdf