https://eupinions.eu/index.php?id=12463
https://publications.parliament.uk/pa/cm201719/cmselect/cmniaf/329/329.pdf
https://rusi.org/sites/default/files/briefingpaper-france-uk-2017.pdf
http://voxeu.org/system/files/epublication/Brexit_Beckons_VoxEU.pdf