http://www.bertelsmann-stiftung.de/fileadmin/files/Projekte/Migration_fair_gestalten/IB_Study_MixedMigration2017_ENG.pdf
http://uk.reuters.com/article/us-britain-eu-negotiations-idUKKBN17R1XJ
http://www.kormany.hu/download/d/2b/21000/JunckerJean-Claude%2020170906.pdf