https://fullfact.org/europe/how-many-free-trade-deals-has-eu-done/
https://www.econstor.eu/bitstream/10419/266146/1/1820832732.pdf
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/fomeef18008en.pdf
https://www.piie.com/sites/default/files/documents/wp22-12.pdf