http://www.transparency.org/news/feature/europe_and_central_asia_an_overall_stagnation
https://www.esri.ie/system/files/publications/SUSTAT123_2.pdf
https://cepr.org/sites/default/files/policy_insights/PolicyInsight92.pdf
https://www.crfb.org/blogs/whats-latest-build-back-better-framework