https://www.esri.ie/system/files/publications/RS185_0.pdf
http://www.consilium.europa.eu/en/press/press-releases/2017/04/29-euco-brexit-guidelines/
http://www.cesifo-group.de/ifoHome/publications/working-papers/CESifoWP/CESifoWPdetails?wp_num=6452&CESifoWP.search=+
https://carnegieendowment.org/politika/88202