https://www.princeton.edu/~rbenabou/papers/beliefs%20qje%201%20web.pdf
http://lislampourlesnuls.blogspot.com/2018/12/charte-officielle-des-gilets-jaunes.html
https://committees.parliament.uk/publications/40412/documents/197199/default/
http://www.lisbon-treaty.org/wcm/the-lisbon-treaty/treaty-on-european-union-and-comments/title-1-common-provisions/7-article-7.html