https://www.cer.eu/sites/default/files/insight_SL_5.11.19_2.pdf
http://www.oxera.com/Latest-Thinking/Publications/Reports/2017/Brexit-ports.aspx
https://ukandeu.ac.uk/wp-content/uploads/2020/05/UKICE-Post-Brexit-Gov-NI-Report.pdf
https://ec.europa.eu/commission/presscorner/api/files/document/print/en/ip_23_4348/IP_23_4348_EN.pdf