http://trade.ec.europa.eu/doclib/docs/2018/october/tradoc_157468.pdf
https://ukandeu.ac.uk/trade-migration-and-brexit/
https://static.europeanchamber.com.cn/upload/documents/documents/Nanjing_Position_Paper_2019_2020[760].pdf
https://www.fraserinstitute.org/sites/default/files/economic-freedom-of-the-world-2021.pdf