https://www.wto.org/english/res_e/reser_e/ullbergpresentation_e.pdf
http://trade.ec.europa.eu/doclib/docs/2018/october/tradoc_157468.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/680366/Technical_Note_-_International_Agreements_in_the_Implementation_Period_-_CLEAN.pdf
https://carnegieendowment.org/files/202110-Brattberg_et_al_EuropeChina_final.pdf