
https://www.ips-journal.eu/topics/foreign-and-security-policy/a-message-of-disunity-7363/

https://big-europe.eu/publication/bringing-the-greater-european-family-together/download

http://blogs.lse.ac.uk/brexit/2018/11/23/hubert-butler-essay-prize-what-happened-to-europe-without-frontiers/