http://www.guengl.eu/uploads/news-documents/Working_paper_Border_controls_on_cross_border_trade_in_goods.pdf
https://www.fbcbj.org/sites/default/files/content-files/European_Business_in_China_Position_Paper_2021_2022%5B964%5D.pdf
https://static.europeanchamber.com.cn/upload/medianews/attachments/European_Chamber_Trade_War_Survey_Results_and_Analysis_Fall_2019[24].pdf