https://dbei.gov.ie/en/Publications/Publication-files/Ireland-and-the-Impacts-of-Brexit.pdf
https://www.gov.uk/guidance/status-of-eu-nationals-in-the-uk-what-you-need-to-know
http://www.reuters.com/article/us-britain-eu-verhofstadt-idUSKBN19V0WP
https://borderlex.net/2021/04/13/comment-quo-vadis-energy-charter-treaty/