http://www.cer.eu/sites/default/files/pb_ireland_brexit_6.7.17.pdf
https://voxeu.org/system/files/epublication/Economics%20of%20Brexit.pdf
https://ukandeu.ac.uk/northern-irelands-vicious-cycle-of-governance-failure/
https://www.theguardian.com/politics/2017/sep/04/uk-trade-deals-after-brexit-theresa-may-eu