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://uk.finance.yahoo.com/news/brexit-risk-destroying-uks-entrepreneurial-start-ups-warwick-business-school-151240554.html
http://www.europarl.europa.eu/cmsdata/115748/IPOL_IDA(2017)583130_EN.pdf