https://www.socialeurope.eu/footballs-tilted-playing-pitch-in-europe
http://www2.assemblee-nationale.fr/documents/notice/15/rapports/r0684/(index)/rapports
https://docs.prosperity.com/2916/0568/0539/The_Legatum_Prosperity_Index_2020.pdf
https://www.esri.ie/system/files/publications/SUSTAT119.pdf