https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef20023en.pdf
https://www.imf.org/en/News/Articles/2024/03/27/germanys-real-challenges-are-aging-underinvestment-and-too-much-red-tape
https://eur-lex.europa.eu/legal-content/FR/TXT/PDF/?uri=CELEX:32019R0452&from=EN
https://www.eca.europa.eu/ECAPublications/RV-2023-04/RV-2023-04_EN.pdf