https://wiiw.ac.at/can-multinationals-withstand-growing-trade-barriers-dlp-6732.pdf
https://www.regjeringen.no/globalassets/upload/kilde/fkd/red/2004/0009/ddd/pdfv/228920-nilf_rapport_2004_9_s.pdf
https://www.econstor.eu/bitstream/10419/266146/1/1820832732.pdf
https://www.fraserinstitute.org/sites/default/files/economic-freedom-of-the-world-2021.pdf