http://blogactiv.eu/blog/2012/05/15/stumbling-towards-the-brexit/
http://www.europarl.europa.eu/RegData/etudes/STUD/2017/602028/IPOL_STU(2017)602028_EN.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/theresa-mays-flip-flops-u-turns/