https://www.boeckler.de/data/downloads/IMK/FMM%20Konferenz%202023/v_2023_10_20_goekten.pdf
https://www.esri.ie/system/files/publications/SUSTAT95_0.pdf
http://www.acea.be/uploads/publications/ACEA_position_paper-Brexit.pdf
http://researchbriefings.files.parliament.uk/documents/CBP-7484/CBP-7484.pdf