
https://blogs.lse.ac.uk/europpblog/2021/07/23/same-legal-status-but-unequal-treatment-bureaucratic-discrimination-against-mobile-eu-citizens/

https://www.boeckler.de/pdf/p_imk_report_141e_2018.pdf

http://www.ips-journal.eu/topics/human-rights/article/show/lets-not-lose-our-thread-2155/