https://www.strategie.gouv.fr/sites/strategie.gouv.fr/files/atoms/files/2020-05-13_etat_des_lieux_du_financement_de_la_protection_sociale.pdf
https://www.brookings.edu/wp-content/uploads/2022/09/Obstfeld-Zhou-Conference-Draft-BPEA-FA22.pdf
https://www.nao.org.uk/wp-content/uploads/2018/01/PFI-and-PF2.pdf