https://www.piie.com/sites/default/files/documents/wp22-12.pdf
https://www.wto.org/english/news_e/pres18_e/pr820_e.htm
https://www.ussif.org/files/GSIR_Review2018F.pdf
https://ecipe.org/blog/trade-relationship-status-open/?mc_cid=88a1251206&mc_eid=286ad5ef5f