
https://www.diw.de/documents/publikationen/73/diw_01.c.578096.de/18-7-3.pdf

https://www.bloomberg.com/news/articles/2017-06-14/ryanair-easyjet-say-soft-brexit-won-t-address-airline-concerns?cmpid=BBBXT061517_BIZ&utm_medium=email&utm_source=newsletter&utm_term=170615&utm_campaign=brexit

https://www.opendemocracy.net/can-europe-make-it/nicola-bertoldi/are-we-living-through-new-weimar-era-constructive-resolutions-for?utm_source=Daily+Newsletter&utm_campaign=367a142d39-DAILY_NEWSLETTER_MAILCHIMP&utm_medium=email&utm_term=0_717bc5d86d-367a142d39-407405485