https://www.esri.ie/system/files/publications/RS164.pdf
https://openknowledge.worldbank.org/bitstream/handle/10986/36647/What-Has-Been-the-Impact-of-COVID-19-on-Debt-Turning-a-Wave-into-a-Tsunami.pdf?sequence=1&isAllowed=y
http://hdr.undp.org/sites/default/files/hdr_2019_overview_-_spanish.pdf
https://rsf.org/en/ranking/2019