http://en.kremlin.ru/events/president/news/69390
https://www.esri.ie/system/files/publications/RB202017_2.pdf
https://pubs.aeaweb.org/doi/pdfplus/10.1257/jep.37.1.3
https://d2071andvip0wj.cloudfront.net/b058-making-the-best-of-frances-libya-summit.pdf