
https://www.consilium.europa.eu/media/ny3j24sm/much-more-than-a-market-report-by-enrico-letta.pdf

https://yougov.co.uk/news/2017/04/26/voting-intention-conservatives-45-labour-29-25-26-/

https://www.theatlantic.com/magazine/archive/2020/12/can-history-predict-future/616993/