
https://www.brookings.edu/articles/tripling-zambias-copper-production-a-way-out-of-the-debt-crisis/

https://ecipe.org/wp-content/uploads/2021/04/ECI_21_PolicyBrief_06_2021_LY07.pdf

https://reutersinstitute.politics.ox.ac.uk/sites/default/files/2020-06/DNR_2020_FINAL.pdf