https://publications.parliament.uk/pa/bills/cbill/2019-2020/0007/20007.pdf
https://ukandeu.ac.uk/long-read/the-protocol-post-brexit-northern-ireland/?mc_cid=9de7c359e6&mc_eid=815b1928ec
https://www.eu2017.ee/news/insights/speech
https://ec.europa.eu/commission/sites/beta-political/files/citizens-rights-essential-principles-draft-position-paper_en.pdf