https://ec.europa.eu/info/sites/info/files/annual-management-and-performance-report-2018.pdf
https://files.taxfoundation.org/20211014170634/International-Tax-Competitiveness-Index-2021.pdf
https://www.nber.org/system/files/working_papers/w27488/w27488.pdf
https://www.bruegel.org/sites/default/files/2023-06/PB%2012%202023.pdf