https://eupinions.eu/index.php?id=12463
http://www.bakermckenzie.com/-/media/files/insight/publications/brexit_tradeflows.pdf?la=en
https://publications.parliament.uk/pa/cm201719/cmselect/cmcumeds/365/365.pdf
https://publications.parliament.uk/pa/ld201719/ldselect/ldeucom/15/15.pdf