
https://www.opendemocracy.net/uk/jeremy-gilbert/forty-years-of-failure-how-to-challenge-narrative-of-hard-brexit

http://researchbriefings.files.parliament.uk/documents/CBP-7840/CBP-7840.pdf

http://www.cesifo-group.de/ifoHome/publications/working-papers/CESifoWP/CESifoWPdetails?wp_num=6441&CESifoWP.search=+