
http://blogs.lse.ac.uk/brexit/2018/05/15/switzerland-wanted-more-immigration-controls-but-economic-self-interest-will-probably-prevail/

https://static1.squarespace.com/static/5a70a7c3010027736a22740f/t/5b5ecb23352f53124f920dc5/1532939059607/Italy+IT+Final_Digital.pdf

https://www.ipg-journal.de/regionen/europa/artikel/detail/wind-in-ihren-segeln-4625/