https://ec.europa.eu/commission/sites/beta-political/files/outline_of_the_political_declaration.pdf
https://www.d-kart.de/en/blog/2020/05/11/ultra-vires/
https://www.publications.parliament.uk/pa/cm201617/cmselect/cmwomeq/799/799.pdf
https://static1.squarespace.com/static/6193d9441f87e0447a3f0803/t/64f5cc87f455c768d1bd1454/1693830286759/Manufacturing+Beyond+Brexit+WEB_0923.pdf