
https://www.brookings.edu/blog/education-plus-development/2020/04/29/the-covid-19-cost-of-school-closures/

https://static.europeanchamber.com.cn/upload/documents/documents/Business_Confidence_Survey_2019_updated[663].pdf

https://www.ips-journal.eu/topics/economy-and-ecology/beyond-russia-the-impacts-of-sanctions-on-the-region-6959/