https://www.occrp.org/en/investigations/hungarys-fidesz-party-paid-eu-official-during-investigation
https://www.strategie.gouv.fr/sites/strategie.gouv.fr/files/atoms/files/fs-na82-entreprises-zombies-octobre-2019.pdf
https://www.lobbying.ie/media/6072/regulation-of-lobbying-annual-report-2016-final-web.pdf
https://curia.europa.eu/jcms/upload/docs/application/pdf/2021-11/cp210197en.pdf