https://www.socialeurope.eu/european-election-defence-and-a-european-constitution
https://theconversation.com/las-matematicas-de-las-votaciones-electronicas-210065
https://www.bbc.com/news/world-europe-54964858
https://uitspraken.rechtspraak.nl/inziendocument?id=ECLI:NL:RBDHA:2020:1878