https://www.diw.de/documents/publikationen/73/diw_01.c.670904.de/19-31-3.pdf
https://wiiw.ac.at/alternatives-in-the-design-of-sovereign-green-bonds-dlp-6412.pdf
https://www.fraserinstitute.org/sites/default/files/economic-freedom-of-the-world-2021.pdf
https://reutersevents.com/Events/reports/docs/magazine-december-2021.pdf