
https://publications.parliament.uk/pa/cm201719/cmselect/cmpubacc/1793/1793.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.nber.org/system/files/working_papers/w28598/w28598.pdf