https://feps-europe.eu/wp-content/uploads/2023/11/PP23_WEB.pdf
https://cepr.org/sites/default/files/policy_insights/PolicyInsight98.pdf
https://ec.europa.eu/info/sites/info/files/economy-finance/ip127_en.pdf
http://www.transparency.org/news/feature/europe_and_central_asia_an_overall_stagnation