https://www.tuc.org.uk/sites/default/files/Brexit%20Legal%20Opinion.pdf
https://www.esri.ie/system/files/publications/RS123.pdf
https://www.etui.org/content/download/36217/363575/file/F-B_07_EN_WEB.pdf
https://journals.sagepub.com/doi/pdf/10.1177/10242589211022550