
https://www.chba.org.uk/for-members/library/overseas-seminars/the-status-of-gibraltar-under-eu-law

https://www.nao.org.uk/wp-content/uploads/2017/07/The-Customs-Declaration-Service.pdf

https://www.lowyinstitute.org/publications/ukraine-effect-demise-or-rebirth-global-order