https://www.bancaditalia.it/pubblicazioni/quaderni-storia/2020-0046/QSE-46.pdf
https://pubs.aeaweb.org/doi/pdfplus/10.1257/jep.36.4.103
http://visegradinsight.eu/app/uploads/2019/11/EaP-2030-Trends.pdf
https://www.esri.ie/system/files/publications/QEC2023SPR_0.pdf