http://www.epc.eu/documents/uploads/pub_7865_realitybites.pdf
https://ec.europa.eu/commission/sites/beta-political/files/guiding-principles-dialogue-ei-ni_en.pdf
http://openeurope.org.uk/today/blog/will-brexit-ground-flights-europe/
https://www.socialeurope.eu/2017/06/britains-deepening-confusion/