https://www.wto.org/english/res_e/booksp_e/anrep_e/anrep17_e.pdf
https://insightcrime.org/investigations/synthetic-silk-road-tracing-china-grey-market-precursor-chemical-trade/
https://ecipe.org/wp-content/uploads/2024/02/ECI_OccasionalPaper_01-2024_LY06.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/680366/Technical_Note_-_International_Agreements_in_the_Implementation_Period_-_CLEAN.pdf