https://emmaclancy.files.wordpress.com/2018/07/apple-tax-structure-and-rate-post-2014.pdf
https://www.occrp.org/en/daily/12149-denmark-will-not-give-aid-to-companies-registered-in-tax-havens
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3305056
https://www.lobbycontrol.de/lobbyregister/bundestag-beschliesst-verbessertes-lobbyregister-112080/