https://single-market-economy.ec.europa.eu/system/files/2023-03/Study%202023%20CRM%20Assessment.pdf
https://www.uokik.gov.pl/news.php?news_id=16818
https://economiesuisse.ch/de/artikel/der-bericht-der-expertengruppe-bankenstabilitaet-als-wichtige-basis
https://www.taxpolicycenter.org/sites/default/files/publication/163549/report-taxing-business-incomes-evidence-from-the-survey-of-consumer-finances.pdf