https://www.ceps.eu/wp-content/uploads/2021/03/PI2021-05_The-power-surplus.pdf
https://publications.parliament.uk/pa/ld5901/ldselect/ldfsrc/133/133.pdf
https://theconversation.com/why-north-korea-may-find-the-souths-new-vision-for-unification-provocative-236971
https://trade.ec.europa.eu/doclib/docs/2017/december/tradoc_156474.pdf