
https://www.crisisgroup.org/europe-central-asia/eastern-europe/ukraine/261-peace-ukraine-iii-costs-war-donbas

https://www.ippr.org/files/2017-09/cej-interim-report-summary-170911.pdf

https://www.sussex.ac.uk/webteam/gateway/file.php?name=briefing-paper-1.pdf&site=18