https://theconversation.com/idea-of-eu-citizenship-still-intangible-for-most-europeans-230994
http://blogs.lse.ac.uk/brexit/2018/11/23/hubert-butler-essay-prize-what-happened-to-europe-without-frontiers/
https://www.socialeurope.eu/the-afd-can-win-on-an-extremist-platform
http://www.institutdelors.eu/media/europeidentitemythes-bouchard-ijd-dec16.pdf?pdf=ok