https://www.wto.org/english/res_e/booksp_e/gvc_dev_report_2019_e.pdf
https://www.unido.org/sites/default/files/files/2019-04/West%20Africa_18.12.18_low.pdf
https://www.project-syndicate.org/commentary/global-economy-downside-risks-by-nouriel-roubini-2017-06
https://www.esri.ie/system/files/publications/RS152.pdf