https://www.socialeurope.eu/2017/07/brexit-to-nowhere/
https://www.kcl.ac.uk/sspp/policy-institute/publications/What-sort-of-Brexit-do-the-British-people-want.pdf
http://www.russellgroup.ac.uk/media/5521/rg-international-students-june-2017.pdf
https://ec.europa.eu/commission/sites/beta-political/files/outline_of_the_political_declaration.pdf