
https://publications.parliament.uk/pa/ld201719/ldselect/ldeucom/63/63.pdf

http://www.esf.be/new/wp-content/uploads/2018/07/ESF-Press-Release-on-Importance-of-Services-Trade-in-EU-UK-Future-Relastionship.pdf

https://www.tandfonline.com/doi/epdf/10.1080/01402382.2023.2168945?needAccess=true&role=button