http://www.ecfr.eu/article/commentary_the_brexit_threat_to_britains_defence_industry
http://letter_to_department_for_exiting_the_european_union_to_publish_the_findings_of_the_analysis_it_has_carried_out_of_the_impact_of_different_brexit_outcomes_for_the_uk_economy
http://www.conservativegroupforeurope.org.uk/wordpress/wp-content/uploads/2017/09/Keeping-the-bridges-open-a-CGE-Policy-Options-Paper-.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/621848/60093_Cm9464_NSS_SDR_Web.pdf