https://cepr.org/sites/default/files/policy_insights/PolicyInsight91.pdf
https://www.nber.org/system/files/working_papers/w27488/w27488.pdf
https://www.suerf.org/docx/f_ec43638b66e16a5bbede9b710b12b0c7_32333_suerf.pdf
https://www.ecb.europa.eu/pub/pdf/other/ecb.escblegalconferenceproceedings201812.en.pdf