http://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:52017SC0201&from=EN
https://ec.europa.eu/commission/publications/terms-reference-article-50-treaty-european-union-negotiations_en
https://www.nece.eu/
https://www.lawfaremedia.org/article/united-states-of-america-v.-donald-j.-trump-and-waltine-nauta