http://www.guengl.eu/uploads/publications-documents/NSkoutarisGUENGLReportC_%28002%29.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/648148/September_-_Joint_technical_note_on_the_comparison_of_EU-UK_positions_on_citizens__rights.pdf
https://infacts.org/fight-brexit-including-changing-mind/
https://publications.parliament.uk/pa/cm201719/cmselect/cmcumeds/365/365.pdf