http://www.ips-journal.eu/regions/global/article/show/davos-2018-call-the-doctor-2544/
https://www.ecb.europa.eu/pub/pdf/ecbu/eb201703.en.pdf?ea7747ab0ef3b038300a8d51a3a95313
https://www.brookings.edu/blog/order-from-chaos/2022/02/18/now-is-not-the-time-to-limit-u-s-natural-gas-exports/?utm_campaign=Brookings%20Brief&utm_medium=email&utm_content=204506322&utm_source=hs_email
https://www.eda.admin.ch/dam/dea/fr/documents/folien/Folien-Abkommen_fr.pdf