https://www.globalwitness.org/en/campaigns/stop-russian-oil/shell-vitol-bring-russian-origin-diesel-europe-despite-swearing-russian-oil/
https://www.ilfattoquotidiano.it/wp-content/uploads/2013/12/sentenzaodoresoldi.pdf
https://www.oecd-ilibrary.org/docserver/19e99855-en.pdf?expires=1684086001&id=id&accname=guest&checksum=289864080528AAE8A1EC0D9ABED148E4