https://www.transparency.org/news/feature/cpi_2018_global_analysis
http://blog.lboro.ac.uk/crcc/general-election/media-coverage-of-the-2017-general-election-campaign-report-4/?utm_source=twitter&utm_medium=social&utm_campaign=ge2017&utm_content=coverage#coverage
http://www.cesifo-group.de/ifoHome/publications/working-papers/CESifoWP/CESifoWPdetails?wp_num=6430&CESifoWP.search=+
https://www.ips-journal.eu/topics/european-integration/towards-fair-european-economies-7464/