https://www.theguardian.com/world/2023/sep/21/italy-po-valley-blighted-air-pollution-worst-europe
https://pubs.aeaweb.org/doi/pdfplus/10.1257/jep.38.3.89
https://www.occrp.org/en/beneficial-ownership-data-is-critical-in-the-fight-against-corruption/this-luxembourg-businessman-got-europes-corporate-registries-shut-down-but-whose-privacy-was-he-protecting
https://www.dbresearch.de/PROD/RPS_DE-PROD/PROD0000000000523908/Deutschland%3A_Konjunktur_kurzgefasst.PDF