http://www.consilium.europa.eu//media/32504/xt21004-ad01re02en18.pdf
https://publications.parliament.uk/pa/bills/cbill/2019-2020/0007/20007.pdf
https://www.gov.uk/government/publications/information-about-the-withdrawal-bill
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/665871/December_-_Joint_technical_note_on_the_comparison_of_EU-UK_positions_on_citizens__rights.pdf