https://europa.eu/eurobarometer/api/deliverable/download/file?deliverableId=85321
https://www.bruegel.org/wp-content/uploads/2022/02/PC-02.pdf
https://www.socialeurope.eu/2017/06/the-case-for-an-investment-state/
https://blogs.lse.ac.uk/europpblog/2021/07/23/same-legal-status-but-unequal-treatment-bureaucratic-discrimination-against-mobile-eu-citizens/