https://publications.parliament.uk/pa/ld5801/ldselect/ldeucom/248/248.pdf
https://www.piie.com/sites/default/files/documents/wp22-12.pdf
https://voxeu.org/system/files/epublication/Economics%20of%20Brexit.pdf
https://www.wto.org/english/res_e/booksp_e/00_wtr19_e.pdf