https://www.europarl.europa.eu/meetdocs/2009_2014/documents/deea/dv/2203_07/2203_07en.pdf
http://www.cesifo-group.de/ifoHome/publications/working-papers/CESifoWP/CESifoWPdetails?wp_num=6430&CESifoWP.search=+
https://www.project-syndicate.org/commentary/nato-at-75-unique-source-of-american-power-in-the-world-by-carla-norrlof-2024-04?barrier=accesspaylog
https://www.progressivepolicy.org/blogs/trade-fact-of-the-week-trump-campaign-proposes-the-highest-u-s-tariff-since-1937/