https://www.businessinsider.com/north-korea-neo-viagra-2016-8
https://time.com/5829508/kim-yo-jong-money-office-39/
https://www.businessinsider.com/north-korean-hackers-stole-2-billion-to-fund-weapons-program-2019-8
https://www.abc.net.au/news/2018-01-06/north-korea-defector-reveals-secrets-of-office-39/9302308
https://www.dw.com/en/north-korea-ramps-up-manufacture-of-illegal-drugs-amid-sanctions/a-40169753
https://www.investopedia.com/financial-edge/0412/the-most-counterfeit-proof-currencies.aspx
https://www.nytimes.com/2006/07/23/magazine/23counterfeit.html
https://en.wikipedia.org/wiki/Room_39
https://www.worldpoliticsreview.com/insights/27839/what-s-behind-the-growing-use-of-illicit-drugs-in-north-korea
https://www.dailynk.com/english/new-crackdown-on-illicit-drugs-tar/
https://en.wikipedia.org/wiki/North_Korea%27s_illicit_activities