http://www.assemblee-nationale.fr/14/pdf/rap-info/i4551.pdf
https://curia.europa.eu/jcms/upload/docs/application/pdf/2020-04/cp200040en.pdf
http://blogs.lse.ac.uk/brexit/2018/05/15/switzerland-wanted-more-immigration-controls-but-economic-self-interest-will-probably-prevail/
https://www.newarab.com/investigations/syrian-airline-haftars-army-profit-human-smuggling