https://www.lse.ac.uk/european-institute/Assets/Documents/LEQS-Discussion-Papers/LEQSPaper169.pdf
https://ec.europa.eu/commission/presscorner/api/files/document/print/ov/speech_22_5493/SPEECH_22_5493_OV.pdf
https://institutdelors.eu/wp-content/uploads/2020/11/Paper-EU-reform.pdf
http://en.euabc.com/upload/rfConstitution_en.pdf