https://www.europarl.europa.eu/RegData/etudes/BRIE/2022/729299/EPRS_BRI(2022)729299_EN.pdf
https://www.investigate-europe.eu/posts/congo-brazzaville-european-oil-companies-petronor-perenco-secret-interests-with-ruling-family
https://fpc.org.uk/wp-content/uploads/2020/12/Unsafe-for-Scrutiny-December-2020-publication.pdf
https://curia.europa.eu/jcms/upload/docs/application/pdf/2021-06/cp210091es.pdf