https://www.publications.parliament.uk/pa/cm201617/cmselect/cmbeis/909/909.pdf
https://www.parliament.uk/documents/lords-committees/eu-select/Third-Interparliamentary-Forum-on-Brexit-statement.pdf
http://www.europarl.europa.eu/RegData/etudes/STUD/2017/602028/IPOL_STU(2017)602028_EN.pdf
http://www.ecfr.eu/page/-/Keeping_Europe_Safe_After_Brexit2.pdf