https://www.osce.org/library/14127?download=true
https://apps.dtic.mil/sti/pdfs/AD1151522.pdf
https://d2071andvip0wj.cloudfront.net/B004-covid-19-seven-trends.pdf
https://www.martenscentre.eu/wp-content/uploads/2022/04/Spring-2022-European-View.pdf