https://www.socialeurope.eu/2017/07/road-soft-brexit/
https://www.chba.org.uk/for-members/library/overseas-seminars/the-status-of-gibraltar-under-eu-law
https://www.socialeurope.eu/wp-content/uploads/2018/05/BP1-Devolution.pdf
http://cep.lse.ac.uk/pubs/download/brexit11.pdf