https://www.politico.com/news/magazine/2023/02/21/joe-bidens-ukrainian-zelenskyy-00083683
https://www.supremecourt.gov/opinions/21pdf/19-1392_6j37.pdf
http://www.lecese.fr/sites/default/files/pdf/Fiches/2017/FI13_raef.pdf http://www.lecese.fr/images/colloque/RAEF2017/RAEFVersionSection2.pdf
https://academic.oup.com/ia/article/99/1/219/6967342?login=false