
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.clingendael.org/sites/default/files/2022-08/long-term-protection-in-europe-needed-for-millions-of-ukrainian-refugees-.pdf

http://www2.warwick.ac.uk/fac/soc/pais/research/researchcentres/irs/crossingthemed/ctm_final_report_4may2017.pdf