https://ecipe.org/wp-content/uploads/2022/05/ECI_22_PolicyBrief_GVC2_06_2022_LY04.pdf
https://www.lobbycontrol.de/wp-content/uploads/gaslobby-studie-lobbycontrol.pdf
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/868378/200227_UK_trade_in_Numbers_full_web_version_final.pdf
https://home.kpmg.com/content/dam/kpmg/nl/pdf/2018/sector/overheid/impact-van-non-tarifaire-handelsbelemmeringen-als-gevolg-van-brexit.pdf