https://www.gov.uk/government/publications/information-about-the-withdrawal-bill
https://fabiusmaximus.com/2016/10/16/stratfor-eu-budget-battles-after-brexit/
https://www.gov.uk/government/news/pms-open-letter-to-eu-citizens-in-the-uk
https://onlinelibrary.wiley.com/doi/epdf/10.1111/jcms.13386