http://www.resolutionfoundation.org/app/uploads/2018/02/IC-international.pdf
http://carnegieeurope.eu/strategiceurope/72634?lang=en
https://www.esri.ie/system/files/publications/RS158_0.pdf
https://s3.eu-central-1.amazonaws.com/euobs-media/59f9f4116a089cec71bf81b76413503a.pdf