http://www.strengthentheeuro.eu/fileadmin/files/user_upload/EZ_flashlight_europe_2017_05_ENG.pdf
http://www.cer.eu/sites/default/files/bulletin_118_js-sl_article2.pdf
https://publications.parliament.uk/pa/ld201719/ldselect/ldeucom/9/9.pdf
https://www.chba.org.uk/for-members/library/overseas-seminars/the-status-of-gibraltar-under-eu-law