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https://www.tandfonline.com/doi/epdf/10.1080/13501763.2023.2236654
https://www.lobbycontrol.de/wp-content/uploads/Lobbyreport-2021_Beispiellose-Skandale-strengere-Lobbyregeln.pdf
https://fpc.org.uk/wp-content/uploads/2022/04/London-Calling-publication-April-2022.pdf