https://www.imk-boeckler.de/fpdf/HBS-008792/p_imk_study_91_2024.pdf
http://neilcummins.com/tie_cog.pdf
https://www.politico.eu/article/eu-news-website-euractiv-mediahuis/?utm_source=POLITICO.EU&utm_campaign=7690689d1d-EMAIL_CAMPAIGN_2023_05_12_02_38&utm_medium=email&utm_term=0_10959edeb5-7690689d1d-%5BLIST_EMAIL_ID%5D
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/974507/20210331_-_CRED_Report_-_FINAL_-_Web_Accessible.pdf