https://www.consilium.europa.eu/media/54923/peg-letter-to-pec-march2022-signed.pdf
http://cep.lse.ac.uk/pubs/download/brexit11.pdf
https://www.socialeurope.eu/2017/06/eurozones-hidden-strength/
http://www.ecb.europa.eu/pub/pdf/other/ebart201703_01.en.pdf