
http://www.rug.nl/research/portal/files/41711829/cesifo1_wp6448.pdf

http://blogs.lse.ac.uk/brexit/2017/07/06/the-1bn-bung-wont-protect-northern-ireland-from-the-pain-of-a-hard-brexit/

https://www.gov.uk/guidance/status-of-eu-nationals-in-the-uk-what-you-need-to-know