https://www.chba.org.uk/for-members/library/overseas-seminars/the-status-of-gibraltar-under-eu-law
http://www.ebrd.com/cs/Satellite?c=Content&cid=1395272118012&d=&pagename=EBRD%2FContent%2FDownloadDocument
https://ec.europa.eu/commission/sites/beta-political/files/communication-credible-enlargement-perspective-western-balkans_en.pdf