https://www.lse.ac.uk/european-institute/Assets/Documents/LEQS-Discussion-Papers/LEQSPaper169.pdf
https://www.ifri.org/sites/default/files/atoms/files/pe-4-2022_mirel.pdf
http://www.congreso.es/consti/constitucion/indice/titulos/articulos.jsp?ini=155&tipo=2