https://www.iedonline.eu/download/2017/IED-REPORT-Bratislava-2017.pdf
https://blogs.lse.ac.uk/brexit/2019/10/09/northern-ireland-depends-on-the-eus-fluid-borders-for-survival/
https://www.socialeurope.eu/2017/06/eu-fateful-year-2017/
https://ec.europa.eu/commission/presscorner/detail/en/ip_20_181