https://www.parlament.cat/document/cataleg/48146.pdf
https://www.consilium.europa.eu/media/45109/210720-euco-final-conclusions-en.pdf
http://www.ecfr.eu/article/commentary_there_is_life_for_the_eu_after_brexit
https://www.brookings.edu/research/a-post-american-europe-and-the-future-of-u-s-strategy/