
https://www.nakedcapitalism.com/2018/02/another-brexit-mess-grandfathering-existing-free-trade-agreements-looks-unlikely.html

https://publications.parliament.uk/pa/ld5801/ldselect/ldeucom/248/248.pdf

https://www.esri.ie/system/files/publications/QEC2019SPR_SA_Bergin.pdf