https://europa.eu/globalstrategy/sites/globalstrategy/files/regions/files/eugs_review_web_0.pdf
http://carnegieeurope.eu/strategiceurope/75351
https://www.gcsp.ch/publications/final-act-legacy-and-future-helsinki-principles-and-osce-50
https://sipri.org/sites/default/files/2017-09/yb17-summary-eng.pdf