https://www.bruegel.org/sites/default/files/2023-09/PB%2017%202023.pdf
https://files.taxfoundation.org/20221013150933/International-Tax-Competitiveness-Index-2022.pdf
http://gabriel-zucman.eu/files/AJZ2017.pdf
https://www.boeckler.de/pdf/p_imk_report_139_2018.pdf