https://qz.com/1776080/how-the-mcdonnell-douglas-boeing-merger-led-to-the-737-max-crisis
https://www.occrp.org/en/balkan-cocaine-wars/
http://www.fdf.org.uk/news.aspx?article=7834
https://www.econstor.eu/bitstream/10419/300311/1/1895160103.pdf