
https://openknowledge.worldbank.org/bitstream/handle/10986/38045/9781464819025.pdf?sequence=5&isAllowed=y

https://www.sciencedirect.com/science/article/pii/S0022199617301411

https://www.bancaditalia.it/media/approfondimenti/2019/pop-bari/approfondimenti-popBari.pdf