http://www.cepii.fr/PDF_PUB/pb/2021/pb2021-36.pdf
https://www.ceps.eu/wp-content/uploads/2013/02/1304.pdf
https://www.nzz.ch/international/radikales-regime-wie-sich-der-kreml-unter-wladimir-putin-radikalisierte-ld.1755674?reduced=true
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