https://www.lobbycontrol.de/wp-content/uploads/gaslobby-studie-lobbycontrol.pdf
https://www.bankofengland.co.uk/-/media/boe/files/working-paper/2022/horses-for-courses-measuring-foreign-supply-chain-exposure.pdf?la=en&hash=4DDAA1DD7E8446384A7C3C6380C00E305142A4F3
https://insightcrime.org/investigations/synthetic-silk-road-tracing-china-grey-market-precursor-chemical-trade/
http://ecipe.org/app/uploads/2018/04/DTRI-final1.pdf