https://ustr.gov/sites/default/files/files/Press/Reports/2018%20National%20Trade%20Estimate%20Report.pdf
http://www.amchameu.eu/sites/default/files/publications/files/transatlanticeconomy2021_fullreporthr.pdf
https://wiiw.ac.at/trade-balances-and-international-competitiveness-in-cyber-physical-digital-task-intensive-ict-capital-intensive-and-traditional-industries-dlp-6561.pdf