
https://www.cesifo-group.de/DocDL/ifoDD_18-01_03-09_Ochsner.pdf

https://ukandeu.ac.uk/explainers/the-protocol-on-ireland-northern-ireland/?mc_cid=2bd4dc8e93&mc_eid=815b1928ec

http://www.oxera.com/Latest-Thinking/Publications/Reports/2017/Brexit-ports.aspx