https://wiiw.ac.at/alternatives-in-the-design-of-sovereign-green-bonds-dlp-6412.pdf
https://www.eca.europa.eu/Lists/News/NEWS1801_16/INSR_SSM2_EN.pdf
https://www.suerf.org/docx/f_ec43638b66e16a5bbede9b710b12b0c7_32333_suerf.pdf
https://scholar.harvard.edu/files/rogoff/files/nber26760_why_is_euro_punching_below_its_weight.pdf