http://voxeu.org/system/files/epublication/Brexit_Beckons_VoxEU.pdf
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/868874/The_Future_Relationship_with_the_EU.pdf
http://www.epc.eu/documents/uploads/pub_7576_northernirelandandbrexit.pdf
http://www.guengl.eu/uploads/publications-documents/NSkoutarisGUENGLReportC_%28002%29.pdf