
https://www.bertelsmann-stiftung.de/fileadmin/files/user_upload/Keeping_friends_closer.pdf

https://www.politico.eu/article/shaky-grounds-secret-slipshod-evidence-eu-use-sanction-russia-oligarchs/

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