
https://wiiw.ac.at/the-impact-of-green-technologies-on-gdp-and-employment-in-the-eu-dlp-6918.pdf

http://trade.ec.europa.eu/doclib/docs/2019/june/tradoc_157964.pdf

https://blogs.lse.ac.uk/brexit/2021/01/11/article-16-of-the-ireland-northern-ireland-protocol-offers-no-quick-fix/