https://publications.parliament.uk/pa/bills/cbill/2019-2020/0007/20007.pdf
https://publications.parliament.uk/pa/cm201719/cmselect/cmexeu/1778/1778.pdf
https://www.socialeurope.eu/2017/06/britains-deepening-confusion/
http://www.ecfr.eu/page/-/Keeping_Europe_Safe_After_Brexit2.pdf