https://ieefa.org/european-lng-tracker
https://www.imf.org/-/media/Files/Countries/ResRep/ECC/corporate-liquidity-and-solvency-in-europe-feb-12-2021-v3.ashx
https://sosapadilla.github.io/files/papers/Bianchi_Sosa-Padilla_PP.pdf
https://www.ilriformista.it/come-litalia-ha-drogato-leconomia-dagli-anni-70-cosi-la-crescita-rimane-un-miraggio-415786/