https://www.europarl.europa.eu/cmsdata/270809/ING2%20Bilcik-Loiseau_CAs_final_v30052023_clean.pdf
https://www.nao.org.uk/wp-content/uploads/2018/01/PFI-and-PF2.pdf
https://publications.parliament.uk/pa/ld5901/ldselect/ldfsrc/133/133.pdf
https://emmaclancy.files.wordpress.com/2018/07/apple-tax-structure-and-rate-post-2014.pdf