http://www.consilium.europa.eu/en/press/press-releases/2017/04/29-euco-brexit-guidelines/
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/766465/The-UKs-future-skills-based-immigration-system-print-ready.pdf
http://oegfe.at/wordpress/2017/05/the-free-movement-of-workers-within-the-eu-and-the-case-of-austria-balancing-distortions-and-adding-value-op-ed-paul-schmidt-the-european-financial-review/
http://uk.reuters.com/article/us-britain-eu-negotiations-idUKKBN17R1XJ